Privilege Escalation in Steeltoe.Management.Endpoint (CVE-2026-50201)
Summary
Vulnerability in Steeltoe.Management.Endpoint (CVE-2026-50201). Confidential information can be exposed externally. Exploitable via EndpointPermissions.Restricted. Mitigation: upgrade to 4.2.0 or later.
Original description
The description as published by the source.
Steeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications. In Steeltoe.Management.Endpoint prior to version 4.2.0 and Steeltoe.Management.EndpointCore prior to version 3.4.0, all Steeltoe actuator endpoints default to EndpointPermissions.Restricted, which is mappeds to Cloud Foundry's read_basic_data permission (granted to Space Auditors and similar low-trust roles). Sensitive actuators including heap dump, environment, and thread dump do not raise this to EndpointPermissions.Full, so CF's read_sensitive_data permission flag is not enforced for those endpoints. Spring Boot's equivalent Cloud Foundry integration gates these endpoints with read_sensitive_data by default. Steeltoe.Management.Endpoint 4.2.0 and Steeltoe.Management.EndpointCore 3.4.0 patch the issue. If an immediate upgrade is not possible, explicitly set RequiredPermissions = EndpointPermissions.Full in the options for HeapDumpEndpointOptions, EnvironmentEndpointOptions, and ThreadDumpEndpointOptions; and/or if heap dump, thread dump, or environment are not needed in production, register only the required actuators individually instead of using AddAllActuators().
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-2026-50201 has been found in Steeltoe.Management.Endpoint.
Attackers can target a specific entry point like EndpointPermissions.Restricted over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 6.5/10.
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-2026-50201" on the vendor's site.
CVE-2026-50201 (Steeltoe.Management.Endpoint) — CWE-269 / CVSS v3 6.5
Attack vector: remote (network-reachable) / no user interaction
Attack surface: EndpointPermissions.Restricted / read_basic_data / EndpointPermissions.Full / read_sensitive_data
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-269) exists in Steeltoe.Management.Endpoint. Attackers reach the vulnerable code path via EndpointPermissions.Restricted.
Check the vendor advisory for the affected versions of Steeltoe.Management.Endpoint. Attack surface: EndpointPermissions.Restricted / read_basic_data / EndpointPermissions.Full / read_sensitive_data.
Severity: Medium (CVSS 6.5/10). 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
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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。
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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 github.com
- advisory nvd.nist.gov
- advisory github.com
- package github.com
- patch github.com
- patch github.com
- web github.com