CVE-2025-26881
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in the WordPress Sticky Content plugin allows attackers to inject malicious scripts into web pages that are then executed when other users view those pages. All WordPress sites using vulnerable versions of the Sticky Content plugin are affected. The vulnerability requires user interaction but can lead to session hijacking, credential theft, or site defacement.
💻 Affected Systems
- WordPress Sticky Content plugin (also called Sticky Menu Block)
⚠️ 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 administrator credentials, take over the WordPress site, install backdoors, or redirect visitors to malicious sites, potentially compromising the entire web server and associated data.
Likely Case
Attackers inject malicious JavaScript to steal user session cookies, redirect users to phishing pages, or deface the website with malicious content visible to all visitors.
If Mitigated
With proper input validation and output encoding, malicious scripts would be neutralized before being stored or displayed, preventing execution in users' browsers.
🎯 Exploit Status
Exploitation requires the attacker to have content creation privileges (like contributor or author role) to inject malicious scripts. The vulnerability details and proof-of-concept are publicly available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 1.0.1
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Sticky Content' or 'Sticky Menu Block'. 4. Click 'Update Now' if available. 5. If no update is available, deactivate and delete the plugin, then install the latest version from WordPress repository.
🔧 Temporary Workarounds
Disable vulnerable plugin
allTemporarily deactivate the Sticky Content plugin until patched
wp plugin deactivate sticky-menu-block
Implement Content Security Policy
allAdd CSP headers to restrict script execution sources
Add to .htaccess: Header set Content-Security-Policy "default-src 'self'; script-src 'self'"
Or add to wp-config.php: header("Content-Security-Policy: default-src 'self'; script-src 'self'");
🧯 If You Can't Patch
- Remove content creation privileges from untrusted users
- Implement web application firewall (WAF) rules to block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins for 'Sticky Content' or 'Sticky Menu Block' version. If version is 1.0.1 or earlier, you are vulnerable.Check Version:
wp plugin get sticky-menu-block --field=versionVerify Fix Applied:
After updating, verify the plugin version is higher than 1.0.1. Test by attempting to inject basic XSS payloads in content areas to ensure they are properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual content submissions containing script tags or JavaScript code
- Multiple failed login attempts following content updates
- User agents containing XSS payload patterns in access logs
Network Indicators:
- Outbound connections to suspicious domains following page views
- Unexpected redirects in HTTP responses
SIEM Query:
source="wordpress.log" AND ("<script" OR "javascript:" OR "onload=" OR "onerror=") AND plugin="sticky-content"