CVE-2024-26077
📋 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 session cookies, perform actions as authenticated users, redirect to malicious sites, or install malware on user systems.
Likely Case
Session hijacking, credential theft, defacement of web pages, or redirection to phishing sites.
If Mitigated
Limited impact with proper input validation, output encoding, and Content Security Policy (CSP) headers in place.
🎯 Exploit Status
Exploitation requires ability to submit data to vulnerable form fields. Stored nature means payload persists until cleaned.
🛠️ 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. Follow Adobe's upgrade documentation for your deployment type (on-premise or cloud). 3. Apply the update to all instances (author and publish). 4. Restart all AEM services.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side input validation to sanitize user input in form fields
Implement custom servlet filter or use AEM's XSS API: org.apache.sling.xss.XSSAPI
Content Security Policy
allImplement CSP headers to restrict script execution
Add CSP headers via dispatcher configuration or AEM filters
🧯 If You Can't Patch
- Implement strict input validation on all form fields using AEM's XSS API
- Deploy Web Application Firewall (WAF) with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Check AEM version via CRXDE Lite or system console. If version is 6.5.20 or earlier, system is vulnerable.Check Version:
curl -u admin:password http://localhost:4502/system/console/status-productinfo.json | grep versionVerify Fix Applied:
Verify AEM version is 6.5.21 or later. Test form fields with XSS payloads to ensure they're properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual form submissions with script tags
- Multiple failed XSS attempts in request logs
- Suspicious content creation/modification
Network Indicators:
- HTTP requests containing script tags in form parameters
- Unusual outbound connections from user browsers
SIEM Query:
source="aem_logs" AND ("<script>" OR "javascript:" OR "onerror=" OR "onload=")