CVE-2026-54033CWE-918

LibreChat: SSRF via User-Provided Custom Endpoint baseURL — no private IP validation on user-configured API base URLs

High · published June 25, 2026

CVSS v3.1
7.7
EPSS
0%
Percentile
27.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.7 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00352 · 27.6th percentile
Weakness
CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-06-25T15:50Z
EPSS history
Timeline
  • 25 JUN 15:50Z
    LibreChat: SSRF via User-Provided Custom Endpoint baseURL — no private IP validation on user-configured API base URLs
    cvelistv5