CVE-2025-36396
📋 TL;DR
IBM Application Gateway versions 23.10 through 25.09 contain a cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious JavaScript into the web interface. This could enable attackers to steal credentials or perform unauthorized actions within trusted user sessions. Only authenticated users can exploit this vulnerability.
💻 Affected Systems
- IBM Application Gateway
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An authenticated malicious insider or compromised account could steal administrator credentials, hijack user sessions, and gain full control over the IBM Application Gateway management interface.
Likely Case
An authenticated attacker with basic privileges could steal session cookies or credentials from other users who view the malicious content, potentially escalating privileges.
If Mitigated
With proper input validation and output encoding implemented, the attack surface is reduced, though the vulnerability still exists in the codebase.
🎯 Exploit Status
Exploitation requires authenticated access to the web interface. The XSS vulnerability is in the Web UI components.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply fix as per IBM Security Bulletin
Vendor Advisory: https://www.ibm.com/support/pages/node/7256857
Restart Required: Yes
Instructions:
1. Review IBM Security Bulletin. 2. Apply the recommended fix or upgrade to a patched version. 3. Restart IBM Application Gateway services. 4. Verify the fix is applied.
🔧 Temporary Workarounds
Implement Content Security Policy (CSP)
allAdd CSP headers to restrict script execution sources
Add 'Content-Security-Policy' header to web server configuration
Restrict User Input
allImplement input validation and output encoding for all user-controllable fields
🧯 If You Can't Patch
- Implement strict access controls to limit who can authenticate to the management interface
- Monitor for suspicious JavaScript injection attempts in web logs and user input fields
🔍 How to Verify
Check if Vulnerable:
Check if IBM Application Gateway version is between 23.10 and 25.09 inclusiveCheck Version:
Check version in IBM Application Gateway admin interface or configuration filesVerify Fix Applied:
Verify the version is updated beyond the vulnerable range and test XSS payloads no longer execute📡 Detection & Monitoring
Log Indicators:
- Unusual JavaScript patterns in user input fields
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- Suspicious POST requests with script tags or JavaScript code to web interface endpoints
SIEM Query:
source="ibm_app_gateway" AND (message="*<script>*" OR message="*javascript:*")