SteeltoeOSS Steeltoe.Management.Endpoint up to 4.1.x authentication bypass

CVSS Meta Temp Score
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CTI Interest Score
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7.6$0-$5k3.79

Summaryinfo

A vulnerability was found in SteeltoeOSS Steeltoe.Management.Endpoint and Steeltoe.Management.EndpointCore up to 4.1.x. It has been declared as critical. Affected is an unknown function. Such manipulation leads to authentication bypass. This vulnerability is referenced as CVE-2026-50194. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in SteeltoeOSS Steeltoe.Management.Endpoint and Steeltoe.Management.EndpointCore up to 4.1.x. It has been rated as critical. Affected by this issue is some unknown processing. The manipulation with an unknown input leads to a authentication bypass vulnerability. Using CWE to declare the problem leads to CWE-288. A product requires authentication, but the product has an alternate path or channel that does not require authentication. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Steeltoe 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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-50194 since 06/04/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available.

Upgrading to version 4.2.0 eliminates this vulnerability. Applying the patch 4cbc352fe89ac2e6c609554e435ab28996fec5e9 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-37801). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.7
VulDB Meta Temp Score: 7.6

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.2
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Authentication bypass
CWE: CWE-288 / CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Steeltoe.Management.Endpoint/Steeltoe.Management.EndpointCore 4.2.0
Patch: 4cbc352fe89ac2e6c609554e435ab28996fec5e9

Timelineinfo

06/04/2026 CVE reserved
06/18/2026 +14 days Advisory disclosed
06/18/2026 +0 days VulDB entry created
06/19/2026 +1 days VulDB entry last update

Sourcesinfo

Advisory: GHSA-58f6-6rj2-3v8r
Status: Confirmed

CVE: CVE-2026-50194 (🔒)
GCVE (CVE): GCVE-0-2026-50194
GCVE (VulDB): GCVE-100-372140
EUVD: 🔒

Entryinfo

Created: 06/18/2026 07:34
Updated: 06/19/2026 05:53
Changes: 06/18/2026 07:34 (66), 06/19/2026 05:53 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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