Permission policy information leakage in Backstage permission system
Impact
A vulnerability in the Backstage permission plugin backend allows callers to extract some information about the conditional decisions returned by the permission policy installed in the permission backend. If the permission system is not in use or if the installed permission policy does not use conditional decisions, there is no impact.
Patches
This issue has been resolved in version 0.6.0 of the permissions backend.
Workarounds
Administrators of the permission policies can ensure that they are crafted in such a way that conditional decisions do not contain any sensitive information.
References
If you have any questions or comments about this advisory:
Open an issue in the Backstage repository Visit our Discord, linked to in Backstage README
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @backstage/plugin-permission-backend | < 0.6.0 | 0.6.0 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N- Weakness (CWE)
CWE-213- Platform
- npm
- Package
@backstage/plugin-permission-backend- Disclosed
- 16.04.2025
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-f8j4-p5cr-p777 - CC BY 4.0
Vulnerability history: @backstage/plugin-permission-backend
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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