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CVE-2026-90474

MCPHub before 1.0.32 OAuth 2.0 Authentication Bypass

CVSS 4.0 7.6 HIGHCVSS 3.1 6.8 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-90474

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-90474

Published

mcphub

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "samanhappy",
                    "product": "mcphub",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "version": "0",
                            "lessThan": "1.0.32",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ],
                    "packageURL": "pkg:npm/%40samanhappy/mcphub"
                }

Original source record · Cite this exact observation · Complete original publisher JSON