MEDIUM

CVE-2026-90474

2026-09-12 CVSS v3.1

CVSS

6.8

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.

Weakness (CWE)

CWE-287 Improper Authentication

EPSS Score

0.3%

Probability of exploitation in next 30 days

22.9th percentile

References

https://github.com/samanhappy/mcphub/blob/v1.0.31/src/services/oauthServerService.ts#L26-L38 https://github.com/samanhappy/mcphub/commit/e927620cd1a80e8691213b01eb8cd6ffa1a66e9f https://github.com/samanhappy/mcphub/releases/tag/v1.0.32 https://github.com/samanhappy/mcphub/security/advisories/GHSA-3m7m-37xf-xp9x https://www.vulncheck.com/advisories/mcphub-before-1.0.32-oauth-2.0-authentication-bypass

View on dbcve.org

Base CVE data derived from NVD (public domain). Enrichment by dbcve.org (CC-BY-4.0). Fetched via API.

Back to CVE