Server-Side Request Forgery (SSRF) in LibreChat - CVE-2025-66201
Published: April 27, 2026
Vulnerability identifier: #VU128112
CSH Severity: Medium
CVSS v4: 8.6 [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]
CVE-ID: CVE-2025-66201
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
LibreChat
How to mitigate CVE-2025-66201
Install security update from vendor's website.
LibreChat - update to 0.8.1 rc2