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VulnerabilityPublished

CVE-2026-50194: SteeltoeOSS Steeltoe.Management.Endpoint · Authentication Bypass Using an Alternate Path or Channel

Affects SteeltoeOSS Steeltoe.Management.EndpointSource CVE Database V5

0
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Not known to be exploited · CVSS 8.2 High : upgrade to 4.2.0 soon.

Data as of 31 Oct 2026, 20:20 UTC

CVSS 3.1 base score
8.2High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 14% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 4.2.0, 3.4.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 17 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 31 Oct 2026.

What to do

Upgrade Steeltoe.Management.Endpoint to 4.2.0; Steeltoe.Management.EndpointCore to 3.4.0.

Affected software

ProductAffectedFixed in
SteeltoeOSSSteeltoe.Management.EndpointAffected
  • <4.2.0
Fixed in
  • 4.2.0
SteeltoeOSSSteeltoe.Management.EndpointCoreAffected
  • >=3.2.2 <3.4.0
Fixed in
  • 3.4.0
NuGetSteeltoeOSS/steeltoe.management.endpointpkg:nuget/SteeltoeOSS/steeltoe.management.endpointOther threatsAffected
  • =3.2.2
  • =3.3.0
  • =4.1.0
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade to Steeltoe.Management.Endpoint versions 3.4.0 or 4.2.0 where this vulnerability is patched. If immediate upgrade is not possible, apply explicit ASP.NET Core authorization (RequireAuthorization) to all sensitive actuator endpoints. Additionally, configure the reverse proxy or load balancer to enforce the Host header value and prevent clients from setting arbitrary ports to mitigate the risk of authentication bypass.

Description

Steeltoe.Management.Endpoint versions 3.2.2, 3.3.0, and 4.1.0 contain an authentication bypass vulnerability when configured to listen on an alternate port. The middleware incorrectly uses the HTTP Host header instead of the actual network socket port to restrict access, allowing potential unauthorized access to management endpoints. Versions 3.4.0 and 4.2.0 address this issue. Mitigations include upgrading to patched versions or applying explicit ASP.NET Core authorization and configuring reverse proxies to validate the Host header.

References

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