CVE-2025-43829
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in Liferay's diagram type products allows remote attackers to inject malicious scripts or HTML via crafted SVG files. When exploited, it enables attackers to execute arbitrary code in victims' browsers, potentially stealing session cookies or performing actions on behalf of authenticated users. Affected systems include Liferay Portal 7.4.3.18-7.4.3.111 and Liferay DXP 2023.Q4.0-2023.Q4.5, 2023.Q3.1-2023.Q3.8, and 7.4 update 18-92.
💻 Affected Systems
- Liferay Portal
- Liferay DXP
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers steal administrator session cookies, gain full administrative access to the Liferay instance, and potentially compromise the entire system or pivot to internal networks.
Likely Case
Attackers steal user session cookies, perform actions on behalf of authenticated users, deface content, or redirect users to malicious sites.
If Mitigated
With proper input validation and output encoding, malicious payloads are neutralized before execution, preventing script injection.
🎯 Exploit Status
Requires ability to upload SVG files to diagram products. Attackers need to craft malicious SVG payloads and have them rendered by victim browsers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Liferay Portal 7.4.3.112+, Liferay DXP 2023.Q4.6+, 2023.Q3.9+, 7.4 update 93+
Vendor Advisory: https://liferay.dev/portal/security/known-vulnerabilities/-/asset_publisher/jekt/content/CVE-2025-43829
Restart Required: No
Instructions:
1. Backup your Liferay instance. 2. Download the appropriate patch from Liferay's customer portal. 3. Apply the patch following Liferay's patch installation guide. 4. Verify the patch was applied successfully.
🔧 Temporary Workarounds
Disable SVG uploads in diagram products
allTemporarily disable SVG file upload functionality in Commerce diagram products until patching is complete.
Modify Liferay configuration to restrict SVG MIME types in portal-ext.properties or through UI settings
Implement input validation for SVG files
allAdd server-side validation to sanitize SVG content before processing.
Implement custom hook or module to validate and sanitize SVG file content using libraries like OWASP Java HTML Sanitizer
🧯 If You Can't Patch
- Implement WAF rules to block malicious SVG payloads containing script tags and JavaScript events
- Restrict SVG upload permissions to trusted users only and implement content security policy (CSP) headers
🔍 How to Verify
Check if Vulnerable:
Check Liferay version via Control Panel → Configuration → Server Administration → System Information. Verify if version falls within affected ranges.Check Version:
Check via Liferay UI or query database: SELECT * FROM Release_ where servletContextName = 'portal'Verify Fix Applied:
After patching, verify version is updated to patched version. Test SVG upload functionality with test payloads to ensure scripts are not executed.📡 Detection & Monitoring
Log Indicators:
- Unusual SVG file uploads
- Multiple failed SVG upload attempts
- Requests containing script tags in SVG content
Network Indicators:
- HTTP requests with SVG files containing JavaScript payloads
- Unusual outbound connections after SVG file access
SIEM Query:
source="liferay.log" AND ("svg" AND ("script" OR "javascript" OR "onload" OR "onerror"))