CVE-2024-6497
📋 TL;DR
This vulnerability allows authenticated WordPress users with Contributor-level access or higher to inject malicious scripts into website pages via the 'url' parameter in the Squirrly SEO plugin. The injected scripts execute whenever users visit the compromised pages, enabling session hijacking, credential theft, or website defacement. All WordPress sites using vulnerable versions of the Squirrly SEO plugin are affected.
💻 Affected Systems
- Squirrly SEO WordPress Plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain administrative access, steal sensitive data, install backdoors, or completely compromise the WordPress site and potentially the underlying server.
Likely Case
Attackers hijack user sessions, steal credentials, redirect users to malicious sites, or deface website content.
If Mitigated
Limited impact with proper input validation, output escaping, and user role restrictions preventing script execution.
🎯 Exploit Status
Exploitation requires authenticated access but is straightforward once an attacker has Contributor-level credentials. Public proof-of-concept exists in security advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 12.3.20 or later
Vendor Advisory: https://wordpress.org/plugins/squirrly-seo/#developers
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find Squirrly SEO plugin. 4. Click 'Update Now' if available. 5. Alternatively, download version 12.3.20+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Disable Squirrly SEO Plugin
allTemporarily disable the vulnerable plugin until patching is possible.
wp plugin deactivate squirrly-seo
Restrict User Roles
allLimit Contributor and higher roles to trusted users only.
🧯 If You Can't Patch
- Implement Web Application Firewall (WAF) rules to block XSS payloads in URL parameters
- Enable Content Security Policy (CSP) headers to restrict script execution sources
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel > Plugins > Squirrly SEO version. If version is 12.3.19 or lower, you are vulnerable.Check Version:
wp plugin get squirrly-seo --field=versionVerify Fix Applied:
Verify Squirrly SEO plugin version is 12.3.20 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /wp-admin/admin-ajax.php with 'url' parameter containing script tags
- Multiple failed login attempts followed by successful Contributor-level login
Network Indicators:
- Incoming requests with JavaScript payloads in URL parameters
- Outbound connections to suspicious domains from your WordPress site
SIEM Query:
source="wordpress.log" AND ("squirrly" OR "admin-ajax") AND ("<script>" OR "javascript:" OR "onerror=")🔗 References
- https://plugins.trac.wordpress.org/browser/squirrly-seo/trunk/controllers/Api.php#L267
- https://plugins.trac.wordpress.org/changeset/3121853/
- https://wordpress.org/plugins/squirrly-seo/#developers
- https://www.wordfence.com/threat-intel/vulnerabilities/id/bb3aa613-8f34-4d96-8ddf-41fcdcf65c59?source=cve
- https://nowotarski.info/wordpress-nonce-authorization/
- https://plugins.trac.wordpress.org/browser/squirrly-seo/trunk/controllers/Api.php#L267
- https://plugins.trac.wordpress.org/changeset/3121853/
- https://wordpress.org/plugins/squirrly-seo/#developers
- https://www.wordfence.com/threat-intel/vulnerabilities/id/bb3aa613-8f34-4d96-8ddf-41fcdcf65c59?source=cve
