CVE-2024-0249
📋 TL;DR
This vulnerability allows attackers to inject malicious scripts into WordPress admin pages via unsanitized parameters in the Advanced Schedule Posts plugin. When high-privilege users like administrators view pages containing the malicious scripts, attackers can steal session cookies, redirect users, or perform actions on their behalf. Only WordPress sites using vulnerable versions of this specific plugin are affected.
💻 Affected Systems
- Advanced Schedule Posts WordPress Plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Administrator account compromise leading to full site takeover, data theft, malware injection, or defacement.
Likely Case
Session hijacking of admin users, credential theft, or unauthorized actions performed with admin privileges.
If Mitigated
Limited impact if proper input validation and output escaping are implemented, or if admin users have script blockers enabled.
🎯 Exploit Status
Exploitation requires social engineering to get admin users to click malicious links. No authentication needed to trigger the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.1.9 or later
Vendor Advisory: https://wpscan.com/vulnerability/e7ee3e73-1086-421f-b586-d415a45a6c8e/
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Advanced Schedule Posts'. 4. Click 'Update Now' if available. 5. Alternatively, download version 2.1.9+ from WordPress repository and manually update.
🔧 Temporary Workarounds
Disable Plugin
allTemporarily disable the vulnerable plugin until patched
wp plugin deactivate advanced-schedule-posts
Web Application Firewall Rules
allBlock requests containing XSS payloads targeting the vulnerable parameter
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution
- Use browser extensions that block reflected XSS attacks for admin users
🔍 How to Verify
Check if Vulnerable:
Check plugin version in WordPress admin under Plugins → Installed Plugins. If version is 2.1.8 or earlier, you are vulnerable.Check Version:
wp plugin get advanced-schedule-posts --field=versionVerify Fix Applied:
Confirm plugin version is 2.1.9 or later in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual GET/POST requests containing script tags or JavaScript payloads to plugin endpoints
- Multiple failed XSS attempts from same IP
Network Indicators:
- HTTP requests with suspicious parameters containing <script>, javascript:, or encoded payloads
SIEM Query:
source="wordpress.log" AND ("advanced-schedule-posts" OR "asp_") AND ("<script>" OR "javascript:" OR "onerror=" OR "onload=")