Server-Side Request Forgery (SSRF) in LibreChat - CVE-2025-66201
Published: April 27, 2026
Vulnerability identifier: #VU128112
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-66201
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: LibreChat
Affected software:
LibreChat
LibreChat
Detailed vulnerability description
The vulnerability allows a remote user to access internal or arbitrary network resources and disclose sensitive information.
The vulnerability exists due to server-side request forgery in the Actions feature when processing specially crafted OpenAPI specifications. A remote user can submit a crafted action definition with a mismatched allowed domain and server URL to access internal or arbitrary network resources and disclose sensitive information.
Exploitation requires access to the Actions feature.
How to mitigate CVE-2025-66201
Install security update from vendor's website.