LibreChat — Ssrf (CVE-2026-54033)
Date: 2026-06
Affected: librechat/librechat
Attack vector: ssrf
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2026-54033
CWE: CWE-918
CVSS: 7.7 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N)

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, LibreChat allows users to configure custom OpenAI-compatible API endpoints by setting a baseURL. This URL is used to construct HTTP requests without any SSRF validation — no private IP check, no scheme restriction, no DNS pinning. An authenticated user can set baseURL to internal network addresses. This vulnerability is fixed in 0.8.4-rc1.


Mitigations:

Architectural layers (MAESTRO):