Steeltoe vulnerable to management-port isolation bypass via spoofed Host header

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Summary

CVECVE-2026-50194
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-17 22:16:23 UTC
Updated2026-06-18 20:16:15 UTC
DescriptionSteeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications. When Steeltoe management endpoints versions 3.2.2 through 3.3.0 and 4.1.0 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. Versions 3.4.0 and 4.2.0 patch the issue. 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 and/or configure the reverse proxy or load balancer to enforce the `Host` header value and prevent clients from setting an arbitrary port.

Risk And Classification

Primary CVSS: v3.1 8.2 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

EPSS: 0.002380000 probability, percentile 0.145830000 (date 2026-06-18)

Problem Types: CWE-288 | CWE-639 | CWE-288 CWE-288: Authentication Bypass Using an Alternate Path or Channel | CWE-639 CWE-639: Authorization Bypass Through User-Controlled Key

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
3.1CNADECLARED8.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA SteeltoeOSS Steeltoe.Management.Endpoint affected < 4.2.0 Not specified
CNA SteeltoeOSS Steeltoe.Management.EndpointCore affected >= 3.2.2, < 3.4.0 Not specified

References

ReferenceSourceLinkTags
github.com/SteeltoeOSS/security-advisories/security/advisories/GHSA-58f6... [email protected] github.com
github.com/SteeltoeOSS/Steeltoe/commit/4cbc352fe89ac2e6c609554e435ab2899... [email protected] github.com
github.com/SteeltoeOSS/Steeltoe/commit/b7ca93c510aaa08d7e4ebec40ce20c581... [email protected] github.com
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