Medium severity6.8NVD Advisory· Published Sep 12, 2026
CVE-2026-90474
CVE-2026-90474
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.
Affected products
2Patches
Vulnerability mechanics
References
5- github.com/samanhappy/mcphub/blob/v1.0.31/src/services/oauthServerService.tsnvd
- github.com/samanhappy/mcphub/commit/e927620cd1a80e8691213b01eb8cd6ffa1a66e9fnvd
- github.com/samanhappy/mcphub/releases/tag/v1.0.32nvd
- github.com/samanhappy/mcphub/security/advisories/GHSA-3m7m-37xf-xp9xnvd
- www.vulncheck.com/advisories/mcphub-before-1.0.32-oauth-2.0-authentication-bypassnvd
News mentions
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