CVE-2025-5841
📋 TL;DR
The ACF Onyx Poll WordPress plugin has a stored XSS vulnerability in versions up to 1.1.9. Authenticated attackers with Contributor access or higher can inject malicious scripts via the 'class' parameter, which execute when users view affected pages. This affects all WordPress sites using vulnerable versions of this plugin.
💻 Affected Systems
- ACF Onyx Poll WordPress Plugin
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal admin credentials, redirect users to malicious sites, deface websites, or install backdoors for persistent access.
Likely Case
Attackers with contributor accounts inject malicious scripts to steal user session cookies or perform phishing attacks against site visitors.
If Mitigated
With proper user role management and input validation, impact is limited to potential data leakage from users viewing malicious content.
🎯 Exploit Status
Exploitation requires authenticated access but is technically simple once attacker has contributor-level credentials.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.2.0
Vendor Advisory: https://wordpress.org/plugins/acf-onyx-poll/#developers
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find ACF Onyx Poll and click 'Update Now'. 4. Verify version is 1.2.0 or higher.
🔧 Temporary Workarounds
Remove vulnerable plugin
allTemporarily disable or remove the ACF Onyx Poll plugin until patched
wp plugin deactivate acf-onyx-poll
wp plugin delete acf-onyx-poll
Restrict user roles
allTemporarily restrict contributor-level access or implement additional authentication controls
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block XSS payloads in 'class' parameter
- Apply strict Content Security Policy (CSP) headers to limit script execution
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → Installed Plugins for ACF Onyx Poll versionCheck Version:
wp plugin get acf-onyx-poll --field=versionVerify Fix Applied:
Verify plugin version is 1.2.0 or higher in WordPress admin📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to poll-related endpoints with script tags in parameters
- Multiple failed login attempts followed by successful contributor login
Network Indicators:
- HTTP requests containing script tags in 'class' parameter values
- Outbound connections to suspicious domains after viewing poll pages
SIEM Query:
source="wordpress.log" AND ("acf-onyx-poll" OR "onyx-poll") AND ("class=" AND ("script" OR "javascript" OR "onerror"))🔗 References
- https://plugins.trac.wordpress.org/browser/acf-onyx-poll/tags/1.1.8/onyx-poll.php
- https://plugins.trac.wordpress.org/browser/acf-onyx-poll/tags/1.2.0/onyx-poll.php#L63
- https://wordpress.org/plugins/acf-onyx-poll/#developers
- https://www.wordfence.com/threat-intel/vulnerabilities/id/9f4302f8-e9da-436f-9b4b-d01d3dbe9f31?source=cve
