CVE-2025-7104
📋 TL;DR
A mass assignment vulnerability in danny-avila/librechat allows attackers to manipulate sensitive fields by sending extra parameters in requests that get automatically bound to internal objects. This affects all versions of librechat and enables attackers to overwrite critical fields like author, access_level, and projectIds, potentially leading to privilege escalation and data manipulation.
💻 Affected Systems
- danny-avila/librechat
📦 What is this software?
Librechat by Librechat
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain administrative privileges, manipulate all chat data, compromise user accounts, and potentially achieve remote code execution through prototype pollution.
Likely Case
Unauthorized users escalate privileges, modify chat data, access restricted information, and manipulate collaborative settings.
If Mitigated
Limited impact with proper input validation and access controls, but still risks data integrity issues.
🎯 Exploit Status
Exploitation requires authenticated access but is straightforward via crafted HTTP requests with extra parameters.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Commit a37bf6719cfbc2de270f7d87b6b85d87cc1768db
Vendor Advisory: https://github.com/danny-avila/librechat/commit/a37bf6719cfbc2de270f7d87b6b85d87cc1768db
Restart Required: Yes
Instructions:
1. Update to the latest version of librechat. 2. Apply commit a37bf6719cfbc2de270f7d87b6b85d87cc1768db. 3. Restart the application. 4. Verify the fix by testing mass assignment attempts.
🔧 Temporary Workarounds
Input Validation Middleware
allImplement server-side validation to reject requests with unexpected parameters.
Implement whitelist validation for all API endpoints
Rate Limiting
allLimit request rates to reduce automated exploitation attempts.
Configure rate limiting on API endpoints
🧯 If You Can't Patch
- Implement strict input validation at the application layer to filter unexpected parameters.
- Deploy a WAF (Web Application Firewall) with rules to detect and block mass assignment attempts.
🔍 How to Verify
Check if Vulnerable:
Send a POST/PUT request to any API endpoint with extra parameters (e.g., 'author' or 'access_level') and check if they are accepted and persisted.Check Version:
Check package.json or git log for commit a37bf6719cfbc2de270f7d87b6b85d87cc1768dbVerify Fix Applied:
Attempt the same mass assignment test after patching; extra parameters should be rejected or ignored.📡 Detection & Monitoring
Log Indicators:
- Unusual parameter names in request logs
- Multiple failed authorization attempts
- Requests with unexpected field names
Network Indicators:
- HTTP requests with excessive parameters
- Patterns of parameter manipulation in API calls
SIEM Query:
source="web_logs" AND (parameter_count > threshold OR parameter_name IN ("author", "access_level", "isCollaborative"))