CVE-2026-54033

HIGH

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

Title source: cna
STIX 2.1

Description

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.

References (1)

Core 1
Core References

Scores

CVSS v3 7.7
EPSS 0.0025
EPSS Percentile 15.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-918
Status published
Products (2)
danny-avila/LibreChat < 0.8.4-rc1
librechat/librechat < 0.8.3
Published Jun 25, 2026
Tracked Since Jun 25, 2026