CVE-2024-26057
📋 TL;DR
This DOM-based Cross-Site Scripting vulnerability in Adobe Experience Manager allows attackers to execute arbitrary JavaScript in victims' browsers by tricking users into clicking malicious links or submitting crafted forms. It affects Adobe Experience Manager versions 6.5.20 and earlier, potentially compromising user sessions and data.
💻 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 through the victim's browser.
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 (CSP) headers in place.
🎯 Exploit Status
Exploitation requires user interaction (clicking malicious link or submitting form). No public exploit code available at this time.
🛠️ 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 deployment type (AEM as a Cloud Service, AEM on-premise, or AMS). 3. Apply the update to all affected instances. 4. Restart AEM services after patching.
🔧 Temporary Workarounds
Implement Content Security Policy
allAdd CSP headers to restrict script execution sources and mitigate XSS attacks.
Add 'Content-Security-Policy' header with appropriate directives in web server configuration
Input Validation and Output Encoding
allImplement server-side validation and proper output encoding for all user inputs.
Configure AEM's XSS protection filters and implement custom validation in components
🧯 If You Can't Patch
- Implement Web Application Firewall (WAF) rules to detect and block XSS payloads
- Restrict user permissions and implement principle of least privilege for all AEM users
🔍 How to Verify
Check if Vulnerable:
Check AEM version via AEM Web Console (/system/console) or by examining the AEM installation directory for version files.Check Version:
Check CRX Package Manager or AEM Welcome page for version information, or examine /apps/cq/core/content/welcome.htmlVerify Fix Applied:
Verify AEM version is 6.5.21 or later and test for XSS vulnerabilities using security scanning tools.📡 Detection & Monitoring
Log Indicators:
- Unusual JavaScript payloads in request logs
- Suspicious user agent strings containing script tags
- Multiple failed XSS attempts
Network Indicators:
- HTTP requests containing script tags or JavaScript in parameters
- Unusual redirect patterns
SIEM Query:
source="aem_access.log" AND ("<script" OR "javascript:" OR "onerror=" OR "onload=")