| Component | LibreChat |
| Severity | high (CVSS 8) |
| CVSS vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N |
| Published (NVD) | 2026-06-25 |
| Last modified | 2026-06-29 |
| Affected versions | librechat <= 0.8.4 librechat = 0.8.5 |
| Fixed in | see the vendor advisory |
| Weakness | CWE-346 |
| CISA KEV | not listed |
NVD 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.
What to do
- NVD lists no fixed version yet: follow the vendor advisory below and keep LibreChat off the public internet until a fix ships.
- Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
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