CVE-2024-52823
📋 TL;DR
This DOM-based XSS vulnerability in Adobe Experience Manager allows attackers to execute arbitrary JavaScript in victims' browsers by tricking them into visiting malicious URLs or submitting crafted data. It affects AEM versions 6.5.21 and earlier. Attackers could steal session cookies, redirect users, or perform actions on their behalf.
💻 Affected Systems
- Adobe Experience Manager
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover, data theft, or malicious actions performed as authenticated users, potentially leading to privilege escalation or lateral movement within the AEM environment.
Likely Case
Session hijacking, credential theft, or defacement of AEM content through injected scripts that run in authenticated users' browsers.
If Mitigated
Limited impact due to proper input validation, output encoding, and Content Security Policy (CSP) headers preventing script execution.
🎯 Exploit Status
Requires user interaction (clicking malicious link or submitting crafted form). Attack complexity is moderate due to DOM manipulation requirements.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.5.22 or later
Vendor Advisory: https://helpx.adobe.com/security/products/experience-manager/apsb24-69.html
Restart Required: Yes
Instructions:
1. Download AEM 6.5.22 or later from Adobe's distribution portal. 2. Apply the service pack following Adobe's upgrade documentation. 3. Restart AEM instances. 4. Verify the update was successful.
🔧 Temporary Workarounds
Implement Content Security Policy
allAdd CSP headers to restrict script execution sources and prevent inline script execution.
Add to Apache/Nginx config or AEM dispatcher: Header set Content-Security-Policy "default-src 'self'; script-src 'self'"
Configure in AEM OSGi configuration: /system/console/configMgr
Input Validation Filters
allDeploy custom servlet filters to sanitize user inputs before DOM processing.
Implement Java filter with OWASP Java Encoder library: String safe = Encode.forHtml(input);
Add to web.xml or OSGi component
🧯 If You Can't Patch
- Implement WAF rules to block XSS payloads in URLs and form submissions
- Restrict user permissions and implement principle of least privilege for AEM users
🔍 How to Verify
Check if Vulnerable:
Check AEM version via CRXDE Lite (/crx/de) or system console. If version is 6.5.21 or earlier, system is vulnerable.Check Version:
curl -u admin:password http://aem-host:4502/system/console/status-productinfo.json | grep versionVerify Fix Applied:
Verify AEM version is 6.5.22 or later. Test with safe XSS payloads to confirm they're properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual URL parameters with script tags or JavaScript events
- Multiple failed XSS attempts in request logs
- Unexpected content modifications in AEM logs
Network Indicators:
- HTTP requests containing <script>, javascript:, or on* event handlers in parameters
- Unusual redirect patterns from AEM instances
SIEM Query:
source="aem-access.log" AND ("<script" OR "javascript:" OR "onclick=" OR "onload=")