CVE-2025-36121
📋 TL;DR
IBM OpenPages 9.1 and 9.0 contains an HTML injection vulnerability that allows authenticated attackers to inject malicious HTML code. When victims view the injected content, it executes in their browser within the security context of the OpenPages site. This affects organizations using vulnerable versions of IBM OpenPages.
💻 Affected Systems
- IBM OpenPages
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, perform phishing attacks, redirect users to malicious sites, or execute client-side attacks within the application context.
Likely Case
Attackers with authenticated access could deface pages, steal user credentials via phishing forms, or perform limited client-side attacks against other authenticated users.
If Mitigated
With proper input validation and output encoding, the injected HTML would be rendered as plain text rather than executable code.
🎯 Exploit Status
Requires authenticated attacker access. Exploitation involves injecting HTML through vulnerable input fields that are then rendered without proper encoding.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply the fix as described in IBM Security Bulletin
Vendor Advisory: https://www.ibm.com/support/pages/node/7248932
Restart Required: No
Instructions:
1. Review IBM Security Bulletin for specific patch details
2. Apply the recommended fix from IBM
3. Verify the fix by testing input validation
🔧 Temporary Workarounds
Input Validation and Output Encoding
allImplement strict input validation and proper output encoding for all user-supplied content
Content Security Policy
allImplement Content Security Policy headers to restrict inline script execution
🧯 If You Can't Patch
- Implement web application firewall rules to detect and block HTML injection attempts
- Restrict user permissions to minimize attack surface
🔍 How to Verify
Check if Vulnerable:
Check if running IBM OpenPages 9.0 or 9.1. Test input fields for HTML injection by attempting to submit HTML tags and checking if they render as HTML.Check Version:
Check OpenPages version through administrative interface or configuration filesVerify Fix Applied:
After applying patch, test the same input fields to ensure HTML tags are properly encoded and displayed as text rather than executed.📡 Detection & Monitoring
Log Indicators:
- Unusual HTML/script content in user input fields
- Multiple failed input validation attempts
Network Indicators:
- HTTP requests containing suspicious HTML/script payloads
SIEM Query:
source="openpages" AND (message="*<script>*" OR message="*javascript:*" OR message="*onclick=*")