CVE-2026-54030
LibreChat: Missing Resource Parameter Validation in MCP OAuth Flow
Description
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.
INFO
Published Date :
June 25, 2026, 3:48 p.m.
Last Modified :
June 25, 2026, 3:48 p.m.
Remotely Exploit :
No
Source :
GitHub_M
Affected Products
The following products are affected by CVE-2026-54030
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update LibreChat to version 0.8.5.
- Validate MCP OAuth resource parameter configuration.
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CVE-2026-54030 vulnerability anywhere in the article.