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CVE-2026-90474

6.8 · MEDIUM

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.

Published Sep 12, 2026CWE-287EPSS 0.55%

Overview

CVE-2026-90474 is a medium-severity vulnerability. It was published on September 12, 2026 and has a CVSS 3.1 base score of 6.8 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.8, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/samanhappy/mcphub/blob/v1.0.31/src/services/oauthServerService.ts#L26-L38GitHubgithub.com/samanhappy/mcphub/commit/e927620cd1a80e8691213b01eb8cd6ffa1a66e9fGitHubgithub.com/samanhappy/mcphub/releases/tag/v1.0.32GitHubgithub.com/samanhappy/mcphub/security/advisories/GHSA-3m7m-37xf-xp9xRefwww.vulncheck.com/advisories/mcphub-before-1.0.32-oauth-2.0-authentication-bypassGitHubgithub.com/samanhappy/mcphub/security/advisories/GHSA-3m7m-37xf-xp9x

How CyberStrike helps

Frequently asked questions

What is CVE-2026-90474?

CVE-2026-90474 is a medium-severity vulnerability. It was published on September 12, 2026 and has a CVSS 3.1 base score of 6.8 (MEDIUM).

How severe is CVE-2026-90474?

This vulnerability has a CVSS 3.1 base score of 6.8, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-90474?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-90474?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-90474 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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