CVE-2026-54030 LibreChat: Missing Resource Parameter Validation in MCP OAuth Flow
Attackers can steal access tokens by exploiting missing validation in the MCP OAuth flow, potentially compromising user accounts and data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-54030?
CVE-2026-54030 is a high-severity vulnerability in Librechat Librechat, published on 25 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-346
Which versions are affected by CVE-2026-54030?
It affects 1 product.
Products include Librechat Librechat.
How do I fix CVE-2026-54030?
No fix has been published for CVE-2026-54030 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-54030 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-54030 exists.
Other vulnerabilities in Librechat Librechat
- CVE-2026-32625 LibreChat Exfiltrates Server Secrets via MCP Server URL Injection
- CVE-2024-11167 Improper Access Control in danny-avila/librechat
- CVE-2026-22252 LibreChat MCP Stdio Remote Command Execution
- CVE-2025-69222 LibreChat is vulnerable to Server-Side Request Forgery due to missing restrictions
- CVE-2024-41704 Path traversal in n/a
Sources
Also known as GHSA-gvpj-vm2f-2m23.