| Component | LibreChat |
| Severity | high (CVSS 7.6) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N |
| Published (NVD) | 2026-03-13 |
| Last modified | 2026-06-17 |
| Affected versions | librechat = 0.8.2 librechat = 0.8.2 librechat = 0.8.2 librechat = 0.8.2 |
| Fixed in | see the vendor advisory |
| Weakness | CWE-306 |
| CISA KEV | not listed |
NVD description
LibreChat is a ChatGPT clone with additional features. From 0.8.2 to 0.8.2-rc3, The MCP (Model Context Protocol) OAuth callback endpoint accepts the redirect from the identity provider and stores OAuth tokens for the user who initiated the flow, without verifying that the browser hitting the redirect URL is logged in or that the logged-in user matches the initiator. An attacker can send the authorization URL to a victim; when the victim completes the flow, the victim’s OAuth tokens are stored on the attacker’s LibreChat account, enabling account takeover of the victim’s MCP-linked services (e.g. Atlassian, Outlook). This vulnerability is fixed in 0.8.3-rc1.
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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