{"id":"CVE-2026-50194","title":"Steeltoe vulnerable to management-port isolation bypass via spoofed Host header","summary":"Steeltoe vulnerable to management-port isolation bypass via spoofed Host header","severity":"high","cvss":8.2,"cwe":["CWE-288","CWE-639"],"vendor":"Steeltoe","product":"Steeltoe.Management.Endpoint","ecosystem":"nuget","affected":["Steeltoe.Management.Endpoint <= 4.1.0","Steeltoe.Management.EndpointCore >= 3.2.2, <= 3.3.0"],"patched":["Steeltoe.Management.Endpoint 4.2.0","Steeltoe.Management.EndpointCore 3.4.0"],"published":"2026-07-02","updated":"2026-07-02","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-58f6-6rj2-3v8r","references":[{"url":"https://github.com/SteeltoeOSS/security-advisories/security/advisories/GHSA-58f6-6rj2-3v8r"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50194"},{"url":"https://github.com/SteeltoeOSS/Steeltoe/commit/4cbc352fe89ac2e6c609554e435ab28996fec5e9"},{"url":"https://github.com/SteeltoeOSS/Steeltoe/commit/b7ca93c510aaa08d7e4ebec40ce20c5811c2c4b6"},{"url":"https://github.com/advisories/GHSA-58f6-6rj2-3v8r"}],"tags":["ghsa","nuget"],"epss":0.00238,"epssPercentile":0.151,"ingestedAt":"2026-07-02T20:42:45.638Z","slug":"CVE-2026-50194","body":"## Overview\n\n### 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.\n\n## Affected packages\n\n- `Steeltoe.Management.Endpoint <= 4.1.0`\n- `Steeltoe.Management.EndpointCore >= 3.2.2, <= 3.3.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `Steeltoe.Management.Endpoint 4.2.0`\n- `Steeltoe.Management.EndpointCore 3.4.0`","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":45.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}