CVE-2025-62255
📋 TL;DR
This CVE describes a self cross-site scripting (XSS) vulnerability in Liferay Portal and DXP that allows remote attackers to inject malicious scripts or HTML via specially crafted attachment filenames. The vulnerability affects users who can edit Knowledge Base articles, potentially leading to session hijacking or unauthorized actions. Affected versions include Liferay Portal 7.4.0-7.4.3.101 and DXP 2023.Q3.1-2023.Q3.5, 7.4 GA through update 92.
💻 Affected Systems
- Liferay Portal
- Liferay DXP
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator sessions, perform unauthorized administrative actions, deface content, or redirect users to malicious sites, potentially leading to complete system compromise.
Likely Case
Attackers with access to edit Knowledge Base articles could inject malicious scripts that execute in other users' browsers, potentially stealing session cookies or performing actions on behalf of authenticated users.
If Mitigated
With proper input validation and output encoding, the risk is limited to minor content manipulation with no significant security impact.
🎯 Exploit Status
Exploitation requires authenticated access to edit Knowledge Base articles and knowledge of XSS payload construction.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Liferay Portal 7.4.3.102+, Liferay DXP 2023.Q3.6+, 7.4 update 93+
Vendor Advisory: https://liferay.dev/portal/security/known-vulnerabilities/-/asset_publisher/jekt/content/CVE-2025-62255
Restart Required: No
Instructions:
1. Apply the latest security patch from Liferay's official repository. 2. Update to fixed versions: Portal 7.4.3.102+ or DXP 2023.Q3.6+/7.4 update 93+. 3. Verify the fix by testing attachment filename input validation.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side input validation to sanitize attachment filenames before processing
Implement custom servlet filter or hook to validate/sanitize filename parameters
Content Security Policy
allImplement strict Content Security Policy headers to mitigate XSS impact
Add CSP header: Content-Security-Policy: default-src 'self'; script-src 'self'
🧯 If You Can't Patch
- Restrict Knowledge Base article editing permissions to trusted users only
- Implement web application firewall (WAF) rules to block XSS payloads in filenames
🔍 How to Verify
Check if Vulnerable:
Test by uploading an attachment with filename containing XSS payload like 'test<script>alert(1)</script>.txt' to Knowledge Base articleCheck Version:
Check Liferay version via Control Panel → Configuration → Server Administration → System InformationVerify Fix Applied:
After patching, attempt the same XSS test - payload should be sanitized or rejected📡 Detection & Monitoring
Log Indicators:
- Unusual attachment uploads with script-like filenames
- Multiple failed upload attempts with special characters
Network Indicators:
- HTTP requests with script tags in filename parameters
- Unusual POST requests to attachment upload endpoints
SIEM Query:
web.url:*attachment* AND (web.param:*<script>* OR web.param:*javascript:* OR web.param:*onerror=*)