CVE-2024-26110
📋 TL;DR
This stored XSS vulnerability in Adobe Experience Manager allows attackers to inject malicious JavaScript into vulnerable form fields. When users visit pages containing these compromised fields, their browsers execute the attacker's code. This affects all Adobe Experience Manager versions 6.5.20 and earlier.
💻 Affected Systems
- Adobe Experience Manager
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator credentials, hijack user sessions, deface websites, or redirect users to malicious sites, potentially leading to complete system compromise.
Likely Case
Attackers inject malicious scripts to steal user session cookies or credentials, enabling account takeover and unauthorized access to sensitive content.
If Mitigated
With proper input validation and output encoding, the risk is reduced to minimal, though the vulnerability still exists in unpatched systems.
🎯 Exploit Status
Exploitation requires access to vulnerable form fields, but the attack itself is straightforward once access is obtained.
🛠️ 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 Adobe Experience Manager 6.5.21 or later from Adobe's official distribution. 2. Follow Adobe's upgrade documentation for your specific deployment type (on-premise or cloud). 3. Apply the update to all affected instances. 4. Restart the AEM service.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side input validation to sanitize user input in form fields
Configure AEM's XSS protection filters in /system/console/configMgr
Content Security Policy
allImplement CSP headers to restrict script execution
Add Content-Security-Policy headers via Apache/Dispatcher configuration
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block XSS payloads
- Disable or restrict access to vulnerable form fields and components
🔍 How to Verify
Check if Vulnerable:
Check AEM version via CRXDE Lite or system console. If version is 6.5.20 or earlier, the system is vulnerable.Check Version:
curl -u admin:password http://localhost:4502/system/console/status-productinfoVerify Fix Applied:
After patching, verify version is 6.5.21 or later and test form fields with XSS payloads to ensure they're properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to form endpoints with script tags
- Requests containing common XSS payloads like <script>alert()</script>
Network Indicators:
- HTTP requests with encoded script payloads in parameters
- Unusual traffic patterns to form submission endpoints
SIEM Query:
source="aem_access.log" AND ("<script" OR "javascript:" OR "onerror=" OR "onload=")