CVE-2025-62393
📋 TL;DR
This vulnerability allows unauthorized users to view limited course information they shouldn't have access to due to insufficient permission checks in the course overview function. It affects Moodle installations with the vulnerable component enabled. The exposure is limited to course details rather than sensitive student data.
💻 Affected Systems
- Moodle
📦 What is this software?
Moodle by Moodle
⚠️ Risk & Real-World Impact
Worst Case
Unauthorized users could map out course structures, instructor assignments, and limited metadata across the entire institution, potentially facilitating social engineering or targeted attacks.
Likely Case
Users with some access could see additional course titles, descriptions, or basic metadata beyond their intended permissions, violating privacy expectations.
If Mitigated
With proper network segmentation and access controls, impact is limited to information disclosure within authorized user groups.
🎯 Exploit Status
Requires authenticated access to Moodle; exploitation involves manipulating course overview requests to bypass permission checks
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Moodle security advisories for specific patched versions
Vendor Advisory: https://moodle.org/mod/forum/discuss.php?d=470381
Restart Required: No
Instructions:
1. Check Moodle security advisory for patched version. 2. Update Moodle to the patched version. 3. Verify course overview permissions are properly enforced.
🔧 Temporary Workarounds
Disable course overview function
allTemporarily disable the vulnerable course overview component until patched
Navigate to Site administration > Plugins > Blocks > Manage blocks and disable course overview if possible
Restrict user permissions
allTighten course access permissions globally as temporary mitigation
Review and restrict course visibility settings in Moodle permissions
🧯 If You Can't Patch
- Implement network segmentation to isolate Moodle instance from sensitive systems
- Enable detailed logging of course access attempts and monitor for permission bypass patterns
🔍 How to Verify
Check if Vulnerable:
Test with different user roles accessing course overviews they shouldn't have permission to viewCheck Version:
Check Moodle version via Site administration > Notifications or version.php fileVerify Fix Applied:
After patching, verify that users can only see courses they're explicitly authorized to access📡 Detection & Monitoring
Log Indicators:
- Unusual patterns of course overview access from users
- Multiple course ID requests from single user in short time
Network Indicators:
- HTTP requests to course overview endpoints with varying course parameters
SIEM Query:
source="moodle_logs" AND (event="course_viewed" OR event="course_overview") | stats count by user, courseid | where count > threshold