CVE-2024-39631
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in the WordPress Contest Gallery plugin allows attackers to inject malicious scripts into web pages. When users view pages containing the malicious content, the scripts execute in their browsers, potentially stealing session cookies or performing actions on their behalf. All WordPress sites using vulnerable versions of Contest Gallery are affected.
💻 Affected Systems
- WordPress Contest Gallery Plugin
📦 What is this software?
Contest Gallery by Contest Gallery
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator session cookies, take over WordPress sites, deface websites, install backdoors, or redirect visitors to malicious sites.
Likely Case
Attackers inject malicious JavaScript 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
Exploitation requires contributor-level access or higher to inject malicious scripts into gallery content.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 23.1.3 or later
Vendor Advisory: https://patchstack.com/database/vulnerability/contest-gallery/wordpress-contest-gallery-plugin-23-1-2-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 Contest Gallery and click 'Update Now'. 4. Verify update completes successfully.
🔧 Temporary Workarounds
Disable Plugin
allTemporarily disable the Contest Gallery plugin until patched
wp plugin deactivate contest-gallery
Restrict User Roles
allLimit gallery editing to trusted administrators only
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block XSS payloads
- Enable Content Security Policy (CSP) headers to restrict script execution
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins for Contest Gallery versionCheck Version:
wp plugin list --name=contest-gallery --field=versionVerify Fix Applied:
Verify Contest Gallery version is 23.1.3 or higher in WordPress plugins list📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to gallery submission endpoints
- JavaScript payloads in gallery content fields
Network Indicators:
- Malicious script tags in HTTP requests to gallery endpoints
SIEM Query:
source="wordpress.log" AND "contest-gallery" AND ("script" OR "javascript" OR "onerror" OR "onload")