CVE-2026-54030 — LibreChat: Missing Resource Parameter Validation in MCP OAuth Flow
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 fr…
Published: 2026-06-25 · CVSS: 8.0 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7