LibreChat — Vulnerability (CVE-2026-54030)
Date: 2026-06
Affected: librechat/librechat
Attack vector: other
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2026-54030
CWE: CWE-346
CVSS: 8 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N)

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.5, LibreChat's MCP OAuth implementation does not validate that the resource parameter from OAuth Protected Resource metadata (RFC 9728) matches the configured MCP server URL, allowing a malicious MCP server to steal access tokens intended for a legitimate server. This vulnerability is fixed in 0.8.5.


Mitigations:

Architectural layers (MAESTRO):