CVE-2024-26037
📋 TL;DR
This DOM-based Cross-Site Scripting vulnerability in Adobe Experience Manager allows attackers to execute arbitrary JavaScript in victims' browsers by tricking users into clicking malicious links or submitting crafted forms. It affects AEM versions 6.5.20 and earlier, potentially compromising user sessions and data.
💻 Affected Systems
- Adobe Experience Manager
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover, session hijacking, data theft, and further exploitation of authenticated users' privileges within the AEM environment.
Likely Case
Session hijacking, data exfiltration from current user's session, and potential redirection to malicious sites.
If Mitigated
Limited impact due to same-origin policy restrictions and user interaction requirements, with potential for minor data leakage.
🎯 Exploit Status
Exploitation requires user interaction (clicking malicious link or submitting form) and knowledge of specific vulnerable endpoints.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.5.21 or later
Vendor Advisory: https://helpx.adobe.com/security/products/experience-manager/apsb24-28.html
Restart Required: Yes
Instructions:
1. Download AEM 6.5.21 or later from Adobe's distribution portal. 2. Apply the service pack following Adobe's upgrade documentation. 3. Restart AEM instances. 4. Verify successful update through AEM's welcome screen version check.
🔧 Temporary Workarounds
Input Validation Enhancement
allImplement additional client-side and server-side input validation for user-controllable data that could reach DOM sinks.
Content Security Policy
allImplement strict Content Security Policy headers to restrict script execution sources.
🧯 If You Can't Patch
- Implement Web Application Firewall (WAF) rules to detect and block XSS payloads.
- Educate users about phishing risks and suspicious links.
🔍 How to Verify
Check if Vulnerable:
Check AEM version via Welcome screen or CRXDE Lite. If version is 6.5.20 or earlier, system is vulnerable.Check Version:
curl -k https://[aem-host]:[port]/libs/granite/core/content/login.html | grep 'AEM 6.5'Verify Fix Applied:
Verify AEM version is 6.5.21 or later via Welcome screen. Test previously vulnerable endpoints with XSS payloads.📡 Detection & Monitoring
Log Indicators:
- Unusual JavaScript payloads in request parameters
- Multiple failed XSS attempts from same source
- Suspicious redirect patterns in access logs
Network Indicators:
- HTTP requests containing script tags or JavaScript in parameters
- Unusual outbound connections following user interaction with AEM
SIEM Query:
source="aem-access.log" AND ("<script" OR "javascript:" OR "onerror=" OR "onload=")