CVE-2025-65798
📋 TL;DR
An incorrect access control vulnerability in usememos memos v0.25.2 allows authenticated users with low-level privileges to modify or delete attachments uploaded by other users. This affects all deployments running the vulnerable version where multiple users have access to the system. The vulnerability stems from improper authorization checks when handling attachment operations.
💻 Affected Systems
- usememos memos
📦 What is this software?
Memos by Usememos
⚠️ Risk & Real-World Impact
Worst Case
Malicious low-privilege users could delete or modify critical attachments uploaded by administrators or other users, potentially causing data loss, service disruption, or unauthorized content modification.
Likely Case
Low-privilege users accidentally or intentionally modifying/deleting attachments belonging to other users within the same organization, leading to data integrity issues and potential operational impact.
If Mitigated
Minimal impact with proper access controls and monitoring in place, though the vulnerability still represents a privilege escalation risk.
🎯 Exploit Status
Exploitation requires authenticated access with any user account. The vulnerability is in the authorization logic, making exploitation straightforward once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v0.25.3 or later
Vendor Advisory: https://github.com/usememos/memos/pull/5217
Restart Required: Yes
Instructions:
1. Backup your memos database and configuration. 2. Stop the memos service. 3. Update to v0.25.3 or later using your deployment method (Docker, binary, etc.). 4. Restart the memos service. 5. Verify the update was successful.
🔧 Temporary Workarounds
Restrict user permissions
allTemporarily reduce attachment permissions for low-privilege users until patching is complete
Implement external access controls
allUse reverse proxy or application firewall rules to restrict attachment modification endpoints
🧯 If You Can't Patch
- Implement strict access controls and monitoring for attachment operations
- Regularly audit attachment access logs and implement alerting for suspicious modification patterns
🔍 How to Verify
Check if Vulnerable:
Check if running memos v0.25.2 by examining the version in the web interface or checking the deployment configuration.Check Version:
Check web interface or run: docker inspect memos_container | grep -i version OR check application logs for version informationVerify Fix Applied:
After updating, verify the version shows v0.25.3 or later and test that low-privilege users cannot modify attachments belonging to other users.📡 Detection & Monitoring
Log Indicators:
- Unauthorized attachment modification attempts
- Attachment DELETE/PUT requests from low-privilege users targeting other users' files
Network Indicators:
- HTTP requests to attachment modification endpoints with mismatched user IDs
SIEM Query:
source="memos" AND (event="attachment_modify" OR event="attachment_delete") AND user_privilege="low" AND target_user!=current_user