CVE-2025-67730
📋 TL;DR
Frappe LMS versions before 2.42.0 contain a stored cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious HTML and JavaScript into description fields. This affects all users of vulnerable Frappe LMS instances, potentially compromising other users who view the injected content.
💻 Affected Systems
- Frappe Learning Management System (LMS)
📦 What is this software?
Learning by Frappe
⚠️ Risk & Real-World Impact
Worst Case
An attacker could steal session cookies, perform actions as other users, redirect to malicious sites, or deploy malware to users' browsers.
Likely Case
Attackers with authenticated access inject malicious scripts that execute when other users view job, course, or batch descriptions, potentially stealing credentials or session data.
If Mitigated
With proper input validation and output encoding, malicious scripts would be neutralized before execution.
🎯 Exploit Status
Exploitation requires authenticated access. The vulnerability is straightforward to exploit once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.42.0
Vendor Advisory: https://github.com/frappe/lms/security/advisories/GHSA-jjc4-j3hw-33h2
Restart Required: Yes
Instructions:
1. Backup your Frappe LMS instance and database. 2. Update to version 2.42.0 or later using your package manager or deployment method. 3. Restart the application server. 4. Verify the update was successful.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement server-side input validation and output encoding for description fields
Content Security Policy
allImplement a strict Content Security Policy header to mitigate XSS impact
🧯 If You Can't Patch
- Restrict authenticated user permissions to minimize who can edit description fields
- Implement web application firewall rules to detect and block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Check if Frappe LMS version is below 2.42.0. Review if description fields accept and execute HTML/JavaScript input.Check Version:
Check Frappe LMS version in admin panel or via command line depending on deployment methodVerify Fix Applied:
After updating to 2.42.0+, test that HTML and JavaScript input in description fields are properly sanitized and do not execute.📡 Detection & Monitoring
Log Indicators:
- Unusual HTML/JavaScript patterns in description field submissions
- Multiple failed sanitization attempts
Network Indicators:
- Unexpected external script loads from Frappe LMS pages
- Suspicious outbound connections after viewing content
SIEM Query:
Search for patterns like <script>, javascript:, or encoded payloads in web application logs for Frappe LMS