CVE-2025-55006
📋 TL;DR
Frappe Learning versions 2.33.0 and below have an SVG upload vulnerability that allows attackers to upload malicious SVG files containing embedded JavaScript. When other users view these files, arbitrary scripts can execute in their browser context, potentially leading to session hijacking or data theft. All users of affected Frappe Learning instances are at risk.
💻 Affected Systems
- Frappe Learning (LMS)
📦 What is this software?
Learning by Frappe
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal user sessions, perform actions as authenticated users, exfiltrate sensitive data, or deploy malware to user browsers.
Likely Case
Attackers upload malicious SVG files that execute JavaScript when viewed, potentially stealing session cookies or performing limited client-side attacks.
If Mitigated
With proper input validation and content security policies, the impact is limited to potential denial of service or minor data leakage.
🎯 Exploit Status
Exploitation requires user interaction (viewing the malicious SVG) and some social engineering to upload files. The vulnerability is in the SVG parsing/sanitization logic.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.34.0
Vendor Advisory: https://github.com/frappe/lms/security/advisories/GHSA-mvxw-r9x4-3vrr
Restart Required: No
Instructions:
1. Update Frappe Learning to version 2.34.0 or higher. 2. Run bench update. 3. Verify the update completed successfully.
🔧 Temporary Workarounds
Disable SVG uploads
allTemporarily disable SVG file uploads through configuration or web server rules
Modify web server configuration to block .svg file uploads
Update Frappe Learning configuration to reject SVG MIME types
Implement Content Security Policy
allAdd strict CSP headers to prevent script execution from uploaded content
Add Content-Security-Policy header with script-src 'self'
Implement strict MIME type checking for uploaded files
🧯 If You Can't Patch
- Implement strict file upload validation to reject SVG files or sanitize them server-side
- Deploy WAF rules to detect and block malicious SVG content
🔍 How to Verify
Check if Vulnerable:
Check if Frappe Learning version is 2.33.0 or below and SVG upload functionality is enabledCheck Version:
bench versionVerify Fix Applied:
Verify version is 2.34.0 or higher and test SVG upload with embedded JavaScript (should be sanitized or rejected)📡 Detection & Monitoring
Log Indicators:
- Unusual SVG file uploads
- Large number of SVG uploads from single user
- Error logs related to SVG parsing
Network Indicators:
- SVG files with script tags in upload requests
- Unusual outbound connections after SVG file access
SIEM Query:
source="frappe-lms" AND (file_extension=".svg" OR mime_type="image/svg+xml")