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Vulnerability Details :

CVE-2026-54030

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-25 Jun, 2026 | 15:48
Updated At-26 Jun, 2026 | 02:04
Rejected At-
Credits

LibreChat: Missing Resource Parameter Validation in MCP OAuth Flow

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:25 Jun, 2026 | 15:48
Updated At:26 Jun, 2026 | 02:04
Rejected At:
â–¼CVE Numbering Authority (CNA)
LibreChat: Missing Resource Parameter Validation in MCP OAuth Flow

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.

Affected Products
Vendor
danny-avila
Product
LibreChat
Versions
Affected
  • < 0.8.5
Problem Types
TypeCWE IDDescription
CWECWE-346CWE-346: Origin Validation Error
Type: CWE
CWE ID: CWE-346
Description: CWE-346: Origin Validation Error
Metrics
VersionBase scoreBase severityVector
3.18.0HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
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
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/danny-avila/LibreChat/security/advisories/GHSA-gvpj-vm2f-2m23
x_refsource_CONFIRM
Hyperlink: https://github.com/danny-avila/LibreChat/security/advisories/GHSA-gvpj-vm2f-2m23
Resource:
x_refsource_CONFIRM
â–¼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/danny-avila/LibreChat/security/advisories/GHSA-gvpj-vm2f-2m23
exploit
Hyperlink: https://github.com/danny-avila/LibreChat/security/advisories/GHSA-gvpj-vm2f-2m23
Resource:
exploit
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
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

0
Information is not available yet

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