CVE-2024-3899
📋 TL;DR
The Gallery Plugin for WordPress versions before 1.8.15 contains a cross-site scripting (XSS) vulnerability in image settings. This allows authenticated users with post-writing privileges (like Authors) to inject malicious scripts that execute when administrators view affected pages. WordPress sites using vulnerable plugin versions are affected.
💻 Affected Systems
- Gallery Plugin for WordPress
📦 What is this software?
Envira Gallery by Enviragallery
⚠️ Risk & Real-World Impact
Worst Case
An attacker with Author privileges could steal administrator session cookies, perform administrative actions on behalf of the admin, or redirect users to malicious sites.
Likely Case
Attackers with Author accounts inject malicious scripts that execute when administrators view plugin settings, potentially leading to session hijacking or site defacement.
If Mitigated
With proper user access controls and Content Security Policy headers, impact is limited to the specific administrator's session viewing the malicious content.
🎯 Exploit Status
Exploitation requires authenticated access with post-writing privileges. The vulnerability is in image settings fields that lack proper sanitization.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.8.15
Vendor Advisory: https://wpscan.com/vulnerability/e3afadda-4d9a-4a51-b744-10de7d8d8578/
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Gallery Plugin' and click 'Update Now'. 4. Verify version shows 1.8.15 or higher.
🔧 Temporary Workarounds
Remove Author Privileges
allTemporarily downgrade or remove Author role from untrusted users until patching is complete.
Disable Plugin
allDeactivate the Gallery Plugin if not essential for site functionality.
🧯 If You Can't Patch
- Implement strict Content Security Policy headers to mitigate XSS impact
- Audit and limit Author role assignments to trusted users only
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → Installed Plugins → Gallery Plugin version. If version is below 1.8.15, system is vulnerable.Check Version:
wp plugin list --name=gallery-plugin --field=versionVerify Fix Applied:
Confirm Gallery Plugin version shows 1.8.15 or higher in WordPress admin plugins page.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to gallery plugin settings endpoints
- Multiple failed login attempts followed by successful Author login
Network Indicators:
- Suspicious JavaScript payloads in gallery-related HTTP requests
SIEM Query:
source="wordpress.log" AND "gallery-plugin" AND ("POST" OR "update") AND ("script" OR "javascript" OR "onload")