CVE-2026-90474

Medium

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.

SeverityMedium

CVSS6.8

Exploit probability—

ProductSamanhappy Mcphub

PublishedSep 12, 2026

First seenSep 12, 2026

Weakness typeCWE-287Improper authentication

How to fix

Update

samanhappy mcphub1.0.32 or later

Patches

github.com/samanhappy/mcphub/commit/e927620cd1a80e8691213b01eb8cd6ffa1a66e9f

Vendor advisories

Affected products

Product	Affected versions	Fixed in
samanhappy mcphub	v < 1.0.32	1.0.32

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