CVE-2026-54030 | BDVDB-2026-343301 Detail

danny-avilaLibreChat

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.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact none. Attack vector: network.

Weaknesses#

CWE-346 Origin Validation Error

References#

https://github.com/danny-avila/LibreChat/security/advisories/GHSA-gvpj-vm2f-2m23

Exploit#

No public exploit known

History#

Version 12026-06-25Record published in the CVE List.
Version 22026-06-26Most recent update recorded in the CVE List.

Published

Published: 2026-06-25
Last modified: 2026-06-26

Vendor information

Vendor: danny-avila
Product: LibreChat

All danny-avila vulnerabilities

Score

8.0 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 6.1.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< 0.8.5
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

8.0 High

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N

Metric breakdown
Attack Vector	Network
Attack Complexity	High
Privileges Required	None
User Interaction	Required
Scope	Changed
Confidentiality	High
Integrity	High
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).