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EUVD-2026-191973

fkie_cve-2024-47762

Backstage is an open framework for building developer portals. Configuration supplied through APP_CONFIG_* environment variables, for example APP_CONFIG_backend_listen_port=7007, where unexpectedly ignoring the visibility defined in configuration schema. This occurred even if the configuration schema specified that they should have backend or secret visibility. This was an intended feature of the APP_CONFIG_* way of supplying configuration, but now clearly goes against the expected behavior of the configuration system. This behavior leads to a risk of potentially exposing sensitive configuration details intended to remain private or restricted to backend processes. The issue has been resolved in version 0.3.75 of the @backstage/plugin-app-backend package. As a temporary measure, avoid supplying secrets using the APP_CONFIG_ configuration pattern. Consider alternative methods for setting secrets, such as the environment substitution available for Backstage configuration.

GHSA-qc4v-xq2m-65wc — Unexpected visibility of environment variable configurations in @backstage/plugin-app-backend

Affected: npm: @backstage/plugin-app-backend

### Impact

Configuration supplied through `APP_CONFIG_*` environment variables, for example `APP_CONFIG_backend_listen_port=7007`, where unexpectedly ignoring the visibility defined in configuration schema. This occurred even if the configuration schema specified that they should have backend or secret visibility. This was an intended feature of the `APP_CONFIG_*` way of supplying configuration, but now clearly goes against the expected behavior of the configuration system. This behavior leads to a risk of potentially exposing sensitive configuration details intended to remain private or restricted to backend processes.

### Patches

The issue has been resolved in version `0.3.75` of the `@backstage/plugin-app-backend` package. Users are encouraged to upgrade to this version to mitigate the vulnerability.

### Workarounds

As a temporary measure, avoid supplying secrets using the `APP_CONFIG_` configuration pattern. Consider alternative methods for setting secrets, such as the [environment substitution](https://backstage.io/docs/conf/writing#environment-variable-substitution) available for Backstage configuration.

### References

If you have any questions or comments about this advisory:

Open an issue in the [Backstage repository](https://github.com/backstage/backstage) Visit our Discord, linked to in [Backstage README](https://github.com/backstage/backstage)

RHBA-2024:11265 — Red Hat Bug Fix Advisory: Red Hat Developer Hub 1.4.0 release.

http-proxy-middleware: http-proxy-middleware: Denial of Service via unhandled error during path matching cross-spawn: regular expression denial of service path-to-regexp: Backtracking regular expressions cause ReDoS body-parser: Denial of Service Vulnerability in body-parser plugin-catalog-backend: prototype pollution vulnerability plugin-techdocs-backend: storage bucket directory traversal in TechDocs plugin-techdocs-backend: circumvention of XSS protection in TechDocs backstage/plugin-app-backend: Unexpected visibility of environment variable configurations in @backstage/plugin-app-backend