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EUVD-2026-328552

fkie_cve-2026-50200

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, 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. Steeltoe.Management.Endpoint 4.2.0 and Steeltoe.Management.EndpointCore 3.4.0 patch the issue. 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; and/or require authorization on actuator endpoints.

GHSA-q62h-354g-5r85 — Steeltoe's env sanitizer misses connection strings — leaks embedded DB passwords

Affected: NuGet: Steeltoe.Management.Endpoint, NuGet: Steeltoe.Management.EndpointCore

### 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 authorizatio…