Improper access control in LibreChat - CVE-2026-44653
Published: June 3, 2026
Vulnerability identifier: #VU133257
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-44653
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to improper access control in the MCP server configuration API endpoints when handling requests for shared MCP server configurations. A remote user can send a request to the MCP server listing or single-server endpoint to disclose sensitive information.
Exposed plaintext values include admin-managed API keys and OAuth client secrets for shared MCP servers.
Affected software
LibreChat
How to mitigate CVE-2026-44653
Install security update from vendor's website.
LibreChat - update to 0.8.4