{"id":"GHSA-58f6-6rj2-3v8r","summary":"Steeltoe vulnerable to management-port isolation bypass via spoofed Host header","details":"### Summary\n\nWhen Steeltoe management endpoints are configured to listen on an alternate port (`Management:Endpoints:Port` is configured), the middleware responsible for restricting access to the endpoints uses the `Host` HTTP header rather than the actual network socket port. \n\n### Impact\n\nAn unauthenticated remote attacker can reach every actuator endpoint using a specially crafted HTTP request.\n\n### Affected configuration\n\n- The application's public port is accessible over from the network.\n- `Management:Endpoints:Port` is configured to a value different from the application's main listener port.\n- The request scheme matches `Management:Endpoints:SslEnabled`. For example, `http` when `SslEnabled` is `false` (the default), or `https` when `SslEnabled` is `true`.\n\n### Mitigations\n\nIf an immediate upgrade to a patched version is not possible:\n\n- Add explicit ASP.NET Core authorization (`RequireAuthorization`) to all sensitive actuator endpoints as a defense-in-depth measure independent of port isolation.\n- Configure the reverse proxy or load balancer to enforce the `Host` header value and prevent clients from setting an arbitrary port.","aliases":["CVE-2026-50194"],"modified":"2026-07-02T20:45:16.313385366Z","published":"2026-07-02T20:29:13Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-07-02T20:29:13Z","nvd_published_at":"2026-06-17T22:16:23Z","cwe_ids":["CWE-288","CWE-639"],"severity":"HIGH"},"references":[{"type":"WEB","url":"https://github.com/SteeltoeOSS/security-advisories/security/advisories/GHSA-58f6-6rj2-3v8r"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50194"},{"type":"WEB","url":"https://github.com/SteeltoeOSS/Steeltoe/commit/4cbc352fe89ac2e6c609554e435ab28996fec5e9"},{"type":"WEB","url":"https://github.com/SteeltoeOSS/Steeltoe/commit/b7ca93c510aaa08d7e4ebec40ce20c5811c2c4b6"},{"type":"PACKAGE","url":"https://github.com/SteeltoeOSS/steeltoe"}],"affected":[{"package":{"name":"Steeltoe.Management.Endpoint","ecosystem":"NuGet","purl":"pkg:nuget/Steeltoe.Management.Endpoint"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.2.0"}]}],"versions":["1.1.0","1.1.0-rc3","4.0.0","4.0.0-beta1","4.0.0-rc1","4.1.0"],"database_specific":{"last_known_affected_version_range":"\u003c= 4.1.0","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-58f6-6rj2-3v8r/GHSA-58f6-6rj2-3v8r.json"}},{"package":{"name":"Steeltoe.Management.EndpointCore","ecosystem":"NuGet","purl":"pkg:nuget/Steeltoe.Management.EndpointCore"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.2.2"},{"fixed":"3.4.0"}]}],"versions":["3.2.2","3.2.3","3.2.4","3.2.5","3.2.6","3.2.7","3.2.8","3.3.0"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-58f6-6rj2-3v8r/GHSA-58f6-6rj2-3v8r.json","last_known_affected_version_range":"\u003c= 3.3.0"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N"}]}