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.NET
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Not in CISA KEV
HIGH severity

CVE-2026-50200 — Steeltoe.Management.Endpo…

HIGHFix: SteeltoeOSS/Steeltoe@bef9f14

CVE-2026-50200 is a high-severity (CVSS 7.5) Information Exposure vulnerability in Steeltoe.Management.Endpoint. A fix is available for Steeltoe.Management.Endpoint — see the affected versions and patch details below.

Steeltoe's env sanitizer misses connection strings — leaks embedded DB passwords

Also known asGHSA-q62h-354g-5r85
Published
Jun 17, 2026
Updated
Aug 12, 2026
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Sep 26, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-50200.

EPSS Exploitation Probability

via FIRST.org ↗
0.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs21th percentile — riskier than 21% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2026-50200 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 379,842 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

2 pkgs affected
.NETSteeltoe.Management.Endpoint.NETSteeltoe.Management.EndpointCore

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects NuGet packages — download data is not available via public APIs for these ecosystems.

Description

Summary

The Sanitizer component in the Environment actuator redacts configuration values by matching the configuration key name against a suffix list. The default list (password, secret, key, token, .*credentials.*, vcap_services) does not cover the standard .NET pattern ConnectionStrings:<name> or Steeltoe Connectors' Steeltoe:Client:<type>:Default:ConnectionString. There is no value-based scrubbing, so full connection string values including embedded Password= and user:pass@host segments are returned verbatim in /actuator/env responses.

Impact

Any caller who can reach /actuator/env can receive connection strings containing plaintext credentials. Those credentials enable direct connection to the backing database, bypassing the application tier.

Affected configuration

  • Application configuration contains credentials in ConnectionStrings:* or *:ConnectionString keys.
  • On standard deployments: env is added to Management:Endpoints:Actuator:Exposure:Include. This is not the default.
  • On Cloud Foundry: the /cloudfoundryapplication/env path is accessible to any authenticated CF user with read_basic_data permissions (Space Auditor and above) regardless of the exposure configuration.

Mitigations

If an immediate upgrade is not possible:

  • On the standard path, remove env from the actuator exposure list.
  • Add .*connectionstring.* to KeysToSanitize as a defense-in-depth measure for both paths.
  • Require authorization on actuator endpoints.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
.NETNuGetSteeltoe.Management.Endpointall versions4.2.0dotnet add package Steeltoe.Management.Endpoint --version 4.2.0
.NETNuGetSteeltoe.Management.EndpointCoreall versions3.4.0dotnet add package Steeltoe.Management.EndpointCore --version 3.4.0

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for Steeltoe.Management.Endpoint, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update Steeltoe.Management.Endpoint to 4.2.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-50200 is resolved across your whole dependency graph.

  3. Workarounds

    Assume what was exposed is already known: rotate any credential, token or key that the affected component could return, restrict the endpoint to callers that genuinely need it, and strip sensitive fields from responses and error output at the boundary rather than relying on the client not to read them.

Frequently Asked Questions

### Summary The `Sanitizer` component in the Environment actuator redacts configuration values by matching the configuration key name against a suffix list. The default list (`password`, `secret`, `key`, `token`, `.*credentials.*`, `vcap_services`) does not cover the standard .NET pattern `ConnectionStrings:<name>` or Steeltoe Connectors' `Steeltoe:Client:<type>:Default:ConnectionString`. There is no value-based scrubbing, so full connection string values including embedded `Password=` and `user:pass@host` segments are returned verbatim in `/actuator/env` responses. ### Impact Any caller wh
O3 Security · Impact-Aware SCA

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CVE-2026-50200: High 7.5 severity | O3 Security