CVE-2026-90474
MCPHub before 1.0.32 OAuth 2.0 Authentication Bypass
CVSS Score
6.8
EPSS Score
0.3%
EPSS Percentile
23th
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.
| CWE | CWE-287 |
| Vendor | samanhappy |
| Product | mcphub |
| Published | Sep 12, 2026 |
| Last Updated | Sep 15, 2026 |
Stay Ahead of the Next One
Get instant alerts for samanhappy mcphub
Be the first to know when new medium vulnerabilities affecting samanhappy mcphub are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
samanhappy / mcphub
0 < 1.0.32
References
github.com: https://github.com/samanhappy/mcphub/security/advisories/GHSA-3m7m-37xf-xp9x github.com: https://github.com/samanhappy/mcphub/commit/e927620cd1a80e8691213b01eb8cd6ffa1a66e9f github.com: https://github.com/samanhappy/mcphub/blob/v1.0.31/src/services/oauthServerService.ts#L26-L38 github.com: https://github.com/samanhappy/mcphub/releases/tag/v1.0.32 vulncheck.com: https://www.vulncheck.com/advisories/mcphub-before-1.0.32-oauth-2.0-authentication-bypass
Credits
🔍 Wayde Shi (PayPal Cyber Security Team)