MCPHub before 1.0.32 contains an authentication bypass vulnerability in its embedded OAuth 2.0 authorization server where client authentication is disabled by default and PKCE enforcement is optional. Attackers who obtain an authorization code through interception can redeem it for access tokens without providing a client secret or PKCE verifier, gaining access to victim accounts and their privileges.
Advisories

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Fixes

Solution

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Workaround

No workaround given by the vendor.

History

Tue, 15 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Sun, 13 Sep 2026 08:30:00 +0000

Type Values Removed Values Added
First Time appeared Samanhappy
Samanhappy mcphub
Vendors & Products Samanhappy
Samanhappy mcphub

Sat, 12 Sep 2026 11:15:00 +0000

Type Values Removed Values Added
Description MCPHub before 1.0.32 contains an authentication bypass vulnerability in its embedded OAuth 2.0 authorization server where client authentication is disabled by default and PKCE enforcement is optional. Attackers who obtain an authorization code through interception can redeem it for access tokens without providing a client secret or PKCE verifier, gaining access to victim accounts and their privileges.
Title MCPHub before 1.0.32 OAuth 2.0 Authentication Bypass
Weaknesses CWE-287
References
Metrics cvssV3_1

{'score': 6.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N'}

cvssV4_0

{'score': 7.6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-15T16:58:58.605Z

Reserved: 2026-09-12T02:03:32.649Z

Link: CVE-2026-90474

cve-icon Vulnrichment

Updated: 2026-09-15T16:58:37.842Z

cve-icon NVD

Status : Received

Published: 2026-09-12T11:16:34.483

Modified: 2026-09-15T17:17:37.400

Link: CVE-2026-90474

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-15T18:30:14Z

Weaknesses