CVE-2026-50194: SteeltoeOSS Steeltoe.Management.Endpoint · Authentication Bypass Using an Alternate Path or Channel
Affects SteeltoeOSS Steeltoe.Management.EndpointSource CVE Database V5
Not known to be exploited · CVSS 8.2 High : upgrade to 4.2.0 soon.
Data as of 31 Oct 2026, 20:20 UTC
- 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:NExploitation evidence
Disclosed: evidence found.
CVE published 17 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| SteeltoeOSSSteeltoe.Management.Endpoint | Affected
| Fixed in
|
| SteeltoeOSSSteeltoe.Management.EndpointCore | Affected
| Fixed in
|
NuGetSteeltoeOSS/steeltoe.management.endpointpkg:nuget/SteeltoeOSS/steeltoe.management.endpointOther threats | Affected
| 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
- github.com/SteeltoeOSS/security-advisories/security/advisories/GHSA-58f6-6rj2-3v8r (opens in a new tab)
- github.com/SteeltoeOSS/Steeltoe/commit/4cbc352fe89ac2e6c609554e435ab28996fec5e9 (opens in a new tab)
- github.com/SteeltoeOSS/Steeltoe/commit/b7ca93c510aaa08d7e4ebec40ce20c5811c2c4b6 (opens in a new tab)