Vulnerability in Steeltoe.Management.Endpoint (CVE-2026-50194)
Summary
Vulnerability in Steeltoe.Management.Endpoint (CVE-2026-50194). Confidential information can be exposed externally. Exploitable via Host. Mitigation: upgrade to 4.2.0 or later.
Original description
The description as published by the source.
Summary
When 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.
Impact
An unauthenticated remote attacker can reach every actuator endpoint using a specially crafted HTTP request.
Affected configuration
- The application's public port is accessible over from the network.
Management:Endpoints:Portis configured to a value different from the application's main listener port.- The request scheme matches
Management:Endpoints:SslEnabled. For example,httpwhenSslEnabledisfalse(the default), orhttpswhenSslEnabledistrue.
Mitigations
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. - Configure the reverse proxy or load balancer to enforce the
Hostheader value and prevent clients from setting an arbitrary port.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-50194 has been found in Steeltoe.Management.Endpoint.
Attackers can target a specific entry point like Host over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 8.2/10.
What to do: upgrade Steeltoe.Management.Endpoint to 4.2.0 or later.
If unsure, ask your IT team or search "Steeltoe.Management.Endpoint CVE-2026-50194" on the vendor's site.
CVE-2026-50194 (Steeltoe.Management.Endpoint) — CWE-288 / CVSS v3 8.2
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: Host / http / SslEnabled / false
Patched: 4.2.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-288) exists in Steeltoe.Management.Endpoint. Attackers reach the vulnerable code path via Host without authentication.
Check the vendor advisory for the affected versions of Steeltoe.Management.Endpoint. Attack surface: Host / http / SslEnabled / false.
Severity: High (CVSS 8.2/10). Confidential information can be exposed externally.
Update to 4.2.0.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'Steeltoe.Management.Endpoint' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'Steeltoe.Management.Endpoint' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
Steeltoe.Management.Endpointを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade Steeltoe.Management.Endpoint to 4.2.0ステージング環境で 4.2.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web github.com
- web github.com