CVE-2025-69220
📋 TL;DR
This vulnerability allows authenticated attackers to modify the behavior of arbitrary LibreChat agents by uploading files to file contexts or file searches without proper permissions. Attackers can alter agent functionality even when they shouldn't have access to those agents. This affects all LibreChat deployments running version 0.8.1-rc2.
💻 Affected Systems
- LibreChat
📦 What is this software?
Librechat by Librechat
Librechat by Librechat
⚠️ Risk & Real-World Impact
Worst Case
Attackers could upload malicious files that alter agent behavior to execute arbitrary code, steal sensitive data, or disrupt agent operations across the entire LibreChat deployment.
Likely Case
Attackers modify agent behavior to perform unauthorized actions, potentially leading to data leakage, service disruption, or privilege escalation within the LibreChat environment.
If Mitigated
With proper access controls, only authorized users can modify agent files, limiting impact to authorized changes within intended agent functionality.
🎯 Exploit Status
Exploitation requires authenticated access and knowledge of agent IDs, but the vulnerability itself is straightforward to exploit once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.8.2-rc2
Vendor Advisory: https://github.com/danny-avila/LibreChat/security/advisories/GHSA-xcmf-rpmh-hg59
Restart Required: Yes
Instructions:
1. Backup your current LibreChat installation and data. 2. Update to version 0.8.2-rc2 using git pull or downloading the release. 3. Restart the LibreChat service. 4. Verify the update was successful.
🔧 Temporary Workarounds
Restrict agent ID access
allImplement additional access controls to limit which users can obtain or use agent IDs
Disable file upload functionality
allTemporarily disable file uploads to agent contexts and searches until patched
🧯 If You Can't Patch
- Implement strict network segmentation to isolate LibreChat instances
- Enforce strong authentication and monitor for unusual file upload patterns
🔍 How to Verify
Check if Vulnerable:
Check if LibreChat version is 0.8.1-rc2 by examining the version in the application interface or configuration filesCheck Version:
Check the application interface or configuration files for version informationVerify Fix Applied:
Verify the version has been updated to 0.8.2-rc2 and test that authenticated users without agent permissions cannot upload files to agent contexts📡 Detection & Monitoring
Log Indicators:
- Unauthorized file upload attempts to agent contexts
- Multiple failed permission checks for agent file operations
- File uploads from users not associated with specific agents
Network Indicators:
- Unusual file upload patterns to agent endpoints
- Multiple file upload requests to different agent IDs from single user
SIEM Query:
source="librechat" AND (event="file_upload" OR event="permission_denied") AND (agent_id NOT IN authorized_agents)🔗 References
- https://cwe.mitre.org/data/definitions/284.html
- https://cwe.mitre.org/data/definitions/862.html
- https://github.com/danny-avila/LibreChat/commit/4b9c6ab1cb9de626736de700c7981f38be08d237
- https://github.com/danny-avila/LibreChat/releases/tag/v0.8.2-rc2
- https://github.com/danny-avila/LibreChat/security/advisories/GHSA-xcmf-rpmh-hg59
- https://owasp.org/Top10/A01_2021-Broken_Access_Control
- https://owasp.org/www-project-web-security-testing-guide/v42/4-Web_Application_Security_Testing/05-Authorization_Testing/02-Testing_for_Bypassing_Authorization_Schema.html
- https://raw.githubusercontent.com/OWASP/ASVS/v5.0.0/5.0/OWASP_Application_Security_Verification_Standard_5.0.0_en.pdf
