CVE-2026-50194
Summary
When 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.
Impact
An unauthenticated remote attacker can reach every actuator endpoint using a specially crafted HTTP request.
Affected configuration
- The application's public port is accessible over from the network.
- Management:Endpoints:Port is configured to a value different from the application's main listener port.
- The request scheme matches Management:Endpoints:SslEnabled. For example, http when SslEnabled is false (the default), or https when SslEnabled is true.
Mitigations
If an immediate upgrade to a patched version is not possible:
- Add explicit ASP.NET Core authorization (RequireAuthorization) to all sensitive actuator endpoints as a defense-in-depth measure independent of port isolation.
- Configure the reverse proxy or load balancer to enforce the Host header value and prevent clients from setting an arbitrary port.
⚡ Watch CVE-2026-50194
Get an email if CVE-2026-50194 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.
Exploitation outlook
- Low exploitation risk0.24% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 15% of all EPSS-scored CVEs.
Advisory coverage (1)
External references
Embed the live status
— this badge updates automatically when the KEV or exploit status changes. How to embed it →
[](https://www.csirts.com/cve/CVE-2026-50194)