CVE-2025-43756
📋 TL;DR
A reflected cross-site scripting (XSS) vulnerability in Liferay Portal and DXP allows authenticated remote attackers to inject malicious JavaScript via the snippet parameter. This affects authenticated users of Liferay Portal 7.4.3.132 and specific Liferay DXP versions from 2024.Q1.13 through 2025.Q2.2. Successful exploitation could lead to session hijacking, data theft, or unauthorized actions within the user's context.
💻 Affected Systems
- Liferay Portal
- Liferay DXP
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attacker steals administrator session cookies, gains full administrative access to the portal, exfiltrates sensitive data, or deploys malware to other users.
Likely Case
Attacker steals authenticated user sessions, performs unauthorized actions within those sessions, or redirects users to malicious sites.
If Mitigated
Limited impact due to proper input validation, output encoding, and Content Security Policy (CSP) headers preventing script execution.
🎯 Exploit Status
Exploitation requires authenticated access and user interaction (clicking malicious link).
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Liferay Portal 7.4.3.133 or later; Liferay DXP 2025.Q1.16, 2025.Q2.3, 2024.Q1.20 or later
Vendor Advisory: https://liferay.dev/portal/security/known-vulnerabilities/-/asset_publisher/jekt/content/CVE-2025-43756
Restart Required: No
Instructions:
1. Download the latest patched version from Liferay's official portal. 2. Follow Liferay's upgrade documentation for your specific version. 3. Apply the patch and verify the fix.
🔧 Temporary Workarounds
Implement Content Security Policy (CSP)
allAdd CSP headers to restrict script execution from untrusted sources.
Add 'Content-Security-Policy: script-src 'self'' to web server configuration
Input Validation Filter
allDeploy a web application firewall (WAF) or custom filter to sanitize snippet parameter inputs.
Configure WAF rules to block malicious script patterns in snippet parameter
🧯 If You Can't Patch
- Implement strict input validation and output encoding for all user inputs, particularly the snippet parameter.
- Deploy a web application firewall (WAF) with XSS protection rules and monitor for exploitation attempts.
🔍 How to Verify
Check if Vulnerable:
Check if your Liferay version matches affected versions; test by attempting to inject basic script payloads into snippet parameter.Check Version:
Check Liferay Control Panel → Server Administration → Properties → liferay.versionVerify Fix Applied:
After patching, test that script injection via snippet parameter no longer executes; verify version is updated to patched release.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests containing script tags or JavaScript in snippet parameter
- Multiple failed login attempts followed by XSS payload requests
Network Indicators:
- HTTP requests with suspicious snippet parameter values containing script tags or JavaScript
SIEM Query:
source="web_server_logs" AND (snippet CONTAINS "<script>" OR snippet CONTAINS "javascript:")