CVE-2026-90474

Summary

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 Software

Weaknesses

• CWE-287: Improper Authentication

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: total

Additional References

• https://github.com/samanhappy/mcphub/security/advisories/GHSA-3m7m-37xf-xp9x

References

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

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