CVE-2025-26766
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in the Leyka WordPress plugin allows attackers to inject malicious scripts into web pages. When users view compromised pages, the scripts execute in their browsers, potentially stealing session cookies or performing actions on their behalf. All WordPress sites using Leyka versions up to 3.31.8 are affected.
💻 Affected Systems
- Leyka 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 administrator session cookies, take over WordPress sites, deface websites, or redirect users to malicious sites.
Likely Case
Attackers inject malicious scripts to steal user session cookies, potentially compromising user accounts and performing unauthorized actions.
If Mitigated
With proper input validation and output encoding, malicious scripts would be neutralized before reaching users' browsers.
🎯 Exploit Status
Stored XSS vulnerabilities are commonly exploited, though specific exploit details for this CVE aren't publicly documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.31.9 or later
Vendor Advisory: https://patchstack.com/database/wordpress/plugin/leyka/vulnerability/wordpress-leyka-plugin-3-31-8-cross-site-scripting-xss-vulnerability?_s_id=cve
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find Leyka plugin. 4. Click 'Update Now' if update available. 5. Alternatively, download latest version from WordPress repository and replace plugin files.
🔧 Temporary Workarounds
Input Validation Filter
allAdd custom input validation to sanitize user inputs before processing
Add custom sanitization functions to WordPress theme functions.php or create a custom plugin
Content Security Policy
allImplement CSP headers to restrict script execution sources
Add 'Content-Security-Policy' header via .htaccess or web server configuration
🧯 If You Can't Patch
- Disable the Leyka plugin temporarily until patching is possible
- Implement web application firewall (WAF) rules to block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Leyka version numberCheck Version:
wp plugin list --name=leyka --field=version (if WP-CLI installed)Verify Fix Applied:
Verify Leyka version is 3.31.9 or higher in WordPress plugins list📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to Leyka endpoints with script tags
- Multiple failed input validation attempts
Network Indicators:
- HTTP requests containing script injection patterns to Leyka endpoints
SIEM Query:
source="web_server" AND (uri="*/leyka/*" OR user_agent="*leyka*") AND (content="<script>" OR content="javascript:")