CVE-2024-36141
📋 TL;DR
This stored XSS vulnerability in Adobe Experience Manager allows low-privileged attackers to inject malicious JavaScript into form fields. When victims browse pages containing the compromised fields, their browsers execute the attacker's code. This affects AEM versions 6.5.20 and earlier.
💻 Affected Systems
- Adobe Experience Manager
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, redirect users to malicious sites, perform actions on behalf of authenticated users, or deploy additional malware payloads.
Likely Case
Session hijacking, credential theft, or defacement of web pages through injected content.
If Mitigated
Limited impact with proper input validation, output encoding, and Content Security Policy (CSP) headers in place.
🎯 Exploit Status
Exploitation requires authenticated low-privileged access to vulnerable form fields.
🛠️ 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 the AEM instance. 4. Verify the update completed successfully.
🔧 Temporary Workarounds
Implement Content Security Policy
allAdd CSP headers to restrict script execution sources and prevent XSS payloads from running.
Add 'Content-Security-Policy' header with appropriate directives to web server configuration
Input Validation and Output Encoding
allImplement server-side validation and proper output encoding for all user inputs in form fields.
Configure AEM's XSS protection filters and implement custom validation components
🧯 If You Can't Patch
- Restrict low-privileged user access to vulnerable form fields and components
- Implement web application firewall (WAF) rules to detect and block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Check AEM version via the Welcome screen or CRX Package Manager. If version is 6.5.20 or earlier, the system is vulnerable.Check Version:
Navigate to AEM Welcome screen or use 'curl http://localhost:4502/libs/granite/core/content/login.html | grep version'Verify Fix Applied:
After patching, verify the version shows 6.5.21 or later and test form fields for XSS payload acceptance.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to form submission endpoints
- Requests containing script tags or JavaScript payloads in parameters
Network Indicators:
- HTTP requests with suspicious script content in form fields
- Unexpected JavaScript execution in user sessions
SIEM Query:
source="aem_access.log" AND (method="POST" AND uri="/content/forms/af/*" AND (body="<script>" OR body="javascript:"))