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.
Severity (CVSS)
| Base score | 8 |
|---|---|
| Severity | High |
| Version | CVSS 3.1 |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N |
| Provided by | CNA |
Weaknesses
- CWE-346 — CWE-346: Origin Validation Error
Affected products
| Vendor | Product | Versions |
|---|---|---|
| danny-avila | LibreChat | < 0.8.5 |
References
- https://github.com/danny-avila/LibreChat/security/advisories/GHSA-gvpj-vm2f-2m23 (x_refsource_CONFIRM)
Generated from the official CVE List on 26 Jun 2026 07:05 UTC.