CVE-2024-26086
📋 TL;DR
This reflected Cross-Site Scripting (XSS) vulnerability in Adobe Experience Manager allows attackers to execute malicious JavaScript in victims' browsers by tricking them into visiting specially crafted URLs. It affects AEM versions 6.5.20 and earlier. The vulnerability requires user interaction but can lead to session hijacking or credential theft.
💻 Affected Systems
- Adobe Experience Manager
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator session cookies, compromise admin accounts, and potentially pivot to internal systems or deploy malware to site visitors.
Likely Case
Attackers steal user session cookies or credentials, perform actions on behalf of authenticated users, or deface website content.
If Mitigated
With proper input validation and output encoding, the attack would fail to execute malicious scripts, limiting impact to failed exploitation attempts.
🎯 Exploit Status
Reflected XSS typically has low exploitation complexity. No public exploit code identified in references.
🛠️ 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 Distribution. 2. Backup current installation. 3. Apply the update following Adobe's upgrade documentation. 4. Restart AEM instances. 5. Verify successful update.
🔧 Temporary Workarounds
Input Validation Filter
allImplement strict input validation and output encoding for URL parameters
Configure AEM's XSS protection filter to sanitize all user inputs
Content Security Policy
allImplement CSP headers to restrict 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 in URLs
- Restrict access to vulnerable instances using network segmentation and authentication
🔍 How to Verify
Check if Vulnerable:
Check AEM version via OSGi console or CRXDE. If version is 6.5.20 or earlier, system is vulnerable.Check Version:
curl -u admin:admin http://localhost:4502/system/console/status-productinfo.json | grep versionVerify Fix Applied:
Verify AEM version is 6.5.21 or later. Test URL parameter injection attempts should no longer execute scripts.📡 Detection & Monitoring
Log Indicators:
- Unusual URL parameters with script tags or JavaScript in access logs
- Multiple failed login attempts following suspicious URL access
Network Indicators:
- HTTP requests containing script tags or JavaScript in URL parameters
- Unusual redirect patterns
SIEM Query:
source="aem_access.log" AND ("<script" OR "javascript:" OR "onerror=" OR "onload=")