CVE-2026-50194: Steeltoe.Management.Endpoint Steeltoe Vulnerable To Management-port Isolation Vulnerability
HIGHCVE-2026-50194 is a HIGH (CVSS 8.2) steeltoe vulnerable to management-port isolation vulnerability (CWE-639: Authorization Bypass Through User-Controlled Key) affecting Steeltoe.Management.Endpoint libraries in the NuGet ecosystem. The issue involves steeltoe vulnerable to management-port isolation bypass via spoofed host header. Remediation is available by upgrading affected packages to version 4.2.0, 3.4.0.
CVE-2026-50194 at a Glance
Security Impact
CVSS: 8.2
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N).
How to Fix CVE-2026-50194
To remediate this vulnerability, upgrade all affected Steeltoe.Management.Endpoint dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade Steeltoe.Management.Endpoint to 4.2.0Upgrade Steeltoe.Management.EndpointCore to 3.4.0Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for Steeltoe.Management.EndpointHow to Check if You Are Affected
To determine whether your application is affected by CVE-2026-50194, inspect your project dependencies for Steeltoe.Management.Endpoint:
inspect dependencies for Steeltoe.Management.EndpointAnalyze the terminal output to locate any version of Steeltoe.Management.Endpoint in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.2.0), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-639: Authorization Bypass Through User-Controlled Key, where the system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. In Steeltoe.Management.Endpoint, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-50194 Affected Steeltoe.Management.Endpoint Versions
2 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
Steeltoe.Management.Endpoint
|
NuGet |
< 4.2.0
|
4.2.0
|
|
Steeltoe.Management.EndpointCore
|
NuGet |
≥ 3.2.2
< 3.4.0
|
3.4.0
|
References
Frequently Asked Questions
What is CVE-2026-50194?
Which Steeltoe.Management.Endpoint versions are affected?
What version fixes CVE-2026-50194?
Is Steeltoe.Management.Endpoint affected?
Is Steeltoe.Management.EndpointCore affected?
What is the CVSS score of CVE-2026-50194?
What CWE is associated with CVE-2026-50194?
How can I check NuGet dependencies for CVE-2026-50194?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-58f6-6rj2-3v8r",
"modified" : "2026-07-02T20:29:13Z",
"published" : "2026-07-02T20:29:13Z",
"aliases" : [ "CVE-2026-50194" ],
"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.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "NuGet",
"name" : "Steeltoe.Management.Endpoint"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "4.2.0"
} ]
} ],
"database_specific" : {
"last_known_affected_version_range" : "<= 4.1.0"
}
}, {
"package" : {
"ecosystem" : "NuGet",
"name" : "Steeltoe.Management.EndpointCore"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "3.2.2"
}, {
"fixed" : "3.4.0"
} ]
} ],
"database_specific" : {
"last_known_affected_version_range" : "<= 3.3.0"
}
} ],
"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"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-288", "CWE-639" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2026-07-02T20:29:13Z",
"nvd_published_at" : "2026-06-17T22:16:23Z"
}
}