# CVE-2026-90474

## Summary

- **CVE ID:** CVE-2026-90474
- **Severity:** HIGH
- **CVSS Score:** 7.6 (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)
- **CWE:** CWE-287
- **Published:** Sep 12, 2026
- **Last Modified:** Sep 15, 2026

## 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

- samanhappy — mcphub (0)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.30%
- **EPSS Percentile:** 22.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._