CVE-2024-26074
📋 TL;DR
This stored Cross-Site Scripting (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 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 steal user session cookies or credentials, perform actions on behalf of authenticated users, or deface specific website components.
If Mitigated
With proper input validation and output encoding, the vulnerability would be prevented, though the underlying code flaw remains.
🎯 Exploit Status
Requires attacker to have access to vulnerable form fields; stored XSS means payload persists
🛠️ 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 distribution portal. 2. Apply the service pack following Adobe's installation guide. 3. Restart all AEM instances. 4. Verify the update was successful.
🔧 Temporary Workarounds
Input Validation Filter
allImplement custom servlet filters to sanitize all user input before processing
Implement Java servlet filter with OWASP Java Encoder library
Content Security Policy
allImplement strict CSP headers to limit script execution
Add 'Content-Security-Policy' header with script-src directives
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block XSS payloads
- Disable or restrict access to vulnerable form fields through permissions
🔍 How to Verify
Check if Vulnerable:
Check AEM version via CRXDE Lite or system console; versions 6.5.20 or earlier are vulnerableCheck Version:
curl -u admin:password http://localhost:4502/system/console/status-productinfoVerify Fix Applied:
Verify version is 6.5.21 or later; test form fields with XSS payloads to confirm sanitization📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to form endpoints
- Requests containing script tags or JavaScript in parameters
Network Indicators:
- HTTP requests with suspicious script payloads in form data
SIEM Query:
source="aem_access.log" AND ("<script" OR "javascript:" OR "onload=" OR "onerror=")