CVE-2023-1334
📋 TL;DR
The RapidLoad Power-Up for Autoptimize WordPress plugin up to version 1.7.1 has a missing capability check on the queue_posts function, allowing authenticated attackers with subscriber-level access to modify the plugin's cache. This vulnerability enables unauthorized cache manipulation, potentially affecting website performance or content delivery. All WordPress sites using vulnerable plugin versions are affected.
💻 Affected Systems
- RapidLoad Power-Up for Autoptimize WordPress plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could poison cache to serve malicious content, redirect users to phishing sites, or degrade website performance through cache manipulation.
Likely Case
Subscribers could modify cache entries to disrupt website functionality or alter content delivery, potentially causing service disruption.
If Mitigated
With proper access controls and monitoring, impact is limited to minor cache manipulation that can be detected and reverted.
🎯 Exploit Status
Exploitation requires authenticated access with subscriber privileges. The vulnerability is straightforward to exploit once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.7.2 and later
Vendor Advisory: https://plugins.trac.wordpress.org/changeset/2877726/unusedcss/trunk/includes/modules/unused-css/UnusedCSS_Admin.php
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find RapidLoad Power-Up for Autoptimize. 4. Click 'Update Now' if available. 5. Alternatively, download version 1.7.2+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Disable plugin
allTemporarily disable the vulnerable plugin until patched
wp plugin deactivate rapidload-power-up-for-autoptimize
Restrict subscriber capabilities
allRemove subscriber access to plugin functions via custom code or security plugin
Add custom WordPress filter to restrict subscriber capabilities for cache functions
🧯 If You Can't Patch
- Implement strict access controls to limit subscriber accounts
- Monitor cache modification logs and implement alerting for unauthorized changes
🔍 How to Verify
Check if Vulnerable:
Check plugin version in WordPress admin under Plugins > Installed Plugins. If version is 1.7.1 or lower, you are vulnerable.Check Version:
wp plugin get rapidload-power-up-for-autoptimize --field=versionVerify Fix Applied:
After updating, verify plugin version shows 1.7.2 or higher. Test subscriber account cannot access cache modification functions.📡 Detection & Monitoring
Log Indicators:
- Unusual cache modification events from subscriber accounts
- Multiple cache purge/rebuild requests from non-admin users
Network Indicators:
- Increased AJAX requests to plugin cache endpoints from user roles
SIEM Query:
source="wordpress" AND (event="cache_modification" OR plugin_action="queue_posts") AND user_role="subscriber"🔗 References
- https://plugins.trac.wordpress.org/changeset/2877726/unusedcss/trunk/includes/modules/unused-css/UnusedCSS_Admin.php?contextall=1&old=2847136&old_path=%2Funusedcss%2Ftrunk%2Fincludes%2Fmodules%2Funused-css%2FUnusedCSS_Admin.php
- https://www.wordfence.com/threat-intel/vulnerabilities/id/f3108ef4-f889-4ae1-b86f-cedf46dcea19
- https://plugins.trac.wordpress.org/changeset/2877726/unusedcss/trunk/includes/modules/unused-css/UnusedCSS_Admin.php?contextall=1&old=2847136&old_path=%2Funusedcss%2Ftrunk%2Fincludes%2Fmodules%2Funused-css%2FUnusedCSS_Admin.php
- https://www.wordfence.com/threat-intel/vulnerabilities/id/f3108ef4-f889-4ae1-b86f-cedf46dcea19
