CVE-2026-90474

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.55% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 45.9% of scored records. A rank, not a probability.

NVD base score

7.6 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-09-23.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-09-12 11:06Z1 MO AGO

Last updated

2026-09-24 14:21Z1 MO AGO

Reserved

2026-09-12

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

High (CVSS 7.6)

CNA CVSS vector

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

Weaknesses

• CWE-287Improper AuthenticationClass

Data version

5.2

Document digest

50b14f0c9ffaea80c39e009bdd8df1090b391da6d4ff154a6b1555d25eb6830d

• github.comGitHub Security Advisory (GHSA-3m7m-37xf-xp9x)https://github.com/samanhappy/mcphub/security/advisories/GHSA-3m7m-37xf-xp9xthird-party-advisoryvendor-advisory
• github.comfix(security): enforce OAuth client auth and S256-only PKCE policyhttps://github.com/samanhappy/mcphub/commit/e927620cd1a80e8691213b01eb8cd6ffa1a66e9fpatch
• github.comgetClient() verifies a registered secret only when one is supplied, at v1.0.31https://github.com/samanhappy/mcphub/blob/v1.0.31/src/services/oauthServerService.ts#L26-L38technical-description
• github.commcphub v1.0.32 Release Noteshttps://github.com/samanhappy/mcphub/releases/tag/v1.0.32release-notes
• www.vulncheck.comVulnCheck Advisory: MCPHub before 1.0.32 OAuth 2.0 Authentication Bypasshttps://www.vulncheck.com/advisories/mcphub-before-1.0.32-oauth-2.0-authentication-bypassthird-party-advisory