LibreChat: Missing Resource Parameter Validation in MCP OAuth Flow

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Summary

CVECVE-2026-54030
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 17:16:40 UTC
Updated2026-06-29 23:55:08 UTC
DescriptionLibreChat 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.

Risk And Classification

Primary CVSS: v3.1 9.3 CRITICAL from [email protected]

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

EPSS: 0.001130000 probability, percentile 0.016850000 (date 2026-07-01)

Problem Types: CWE-346 | CWE-346 CWE-346: Origin Validation Error

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary9.3CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
3.1[email protected]Secondary8HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
3.1CNADECLARED8HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Librechat Librechat 0.8.5 rc1 All All
Application Librechat Librechat All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Danny-avila LibreChat affected < 0.8.5 Not specified

References

ReferenceSourceLinkTags
github.com/danny-avila/LibreChat/security/advisories/GHSA-gvpj-vm2f-2m23 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com Exploit, Vendor Advisory
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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