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NVD Vulnerability Details :
CVE-2026-54030
Analyzed
More InfoOfficial Page
Source-security-advisories@github.com
View Known Exploited Vulnerability (KEV) details
Published At-25 Jun, 2026 | 17:16
Updated At-29 Jun, 2026 | 23:55

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.18.0HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
Primary3.19.3CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
N/A
Type: Secondary
Version: 3.1
Base score: 8.0
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
Type: Primary
Version: 3.1
Base score: 9.3
Base severity: CRITICAL
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Type: N/A
Version:
Base score:
Base severity: N/A
Vector:
CPE Matches
librechat
librechat
>>librechat>>Versions up to 0.8.4(inclusive)
cpe:2.3:a:librechat:librechat:*:*:*:*:*:*:*:*
librechat
librechat
>>librechat>>0.8.5
cpe:2.3:a:librechat:librechat:0.8.5:rc1:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-346Secondarysecurity-advisories@github.com
CWE ID: CWE-346
Type: Secondary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/danny-avila/LibreChat/security/advisories/GHSA-gvpj-vm2f-2m23security-advisories@github.com
Exploit
Vendor Advisory
https://github.com/danny-avila/LibreChat/security/advisories/GHSA-gvpj-vm2f-2m23134c704f-9b21-4f2e-91b3-4a467353bcc0
Exploit
Vendor Advisory
Hyperlink: https://github.com/danny-avila/LibreChat/security/advisories/GHSA-gvpj-vm2f-2m23
Source: security-advisories@github.com
Resource:
Exploit
Vendor Advisory
Hyperlink: https://github.com/danny-avila/LibreChat/security/advisories/GHSA-gvpj-vm2f-2m23
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Resource:
Exploit
Vendor Advisory
Change History
0Changes found
Details not found