CVE-2024-26083
📋 TL;DR
Adobe Experience Manager versions 6.5.20 and earlier contain a stored cross-site scripting vulnerability in form fields. An attacker can inject malicious JavaScript that executes in victims' browsers when they view compromised pages. This affects all users of vulnerable Adobe Experience Manager instances.
💻 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 via drive-by downloads.
Likely Case
Session hijacking, credential theft, or defacement of web pages through injected content.
If Mitigated
Limited impact with proper input validation, output encoding, and Content Security Policy headers in place.
🎯 Exploit Status
Requires attacker to have access to inject content into vulnerable form fields, typically through authenticated access or other entry points.
🛠️ 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 upgrade documentation. 3. Restart the AEM instance. 4. Verify the update was successful.
🔧 Temporary Workarounds
Implement Content Security Policy
allAdd Content Security Policy headers to restrict script execution from untrusted sources.
Add 'Content-Security-Policy: script-src 'self'' to HTTP headers
Input Validation Filter
allImplement server-side input validation to sanitize form field inputs.
Configure AEM's XSS protection filters in /system/console/configMgr
🧯 If You Can't Patch
- Restrict user permissions to minimize who can submit content to vulnerable form fields.
- Implement web application firewall rules to block XSS payload patterns.
🔍 How to Verify
Check if Vulnerable:
Check AEM version via the welcome page or OSGi console. Versions 6.5.20 and earlier are vulnerable.Check Version:
Check /system/console/bundles for org.apache.sling.servlets.get version or visit /libs/granite/core/content/login.html welcome pageVerify Fix Applied:
Verify AEM 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 form submissions with script tags or JavaScript code in request parameters
- Multiple failed XSS attempts in access logs
Network Indicators:
- HTTP requests containing script tags or JavaScript in form parameters
- Unexpected outbound connections from client browsers after visiting AEM pages
SIEM Query:
source="aem_access.log" AND ("<script" OR "javascript:" OR "onerror=" OR "onload=")