Backstage: Improper Access Control in Backend Action Invocation
Impact
An authenticated user could invoke actions that an operator had excluded through action configuration. Existing action permissions and downstream authorization remain enforced.
Patches
Patched in @backstage/backend-defaults version 0.17.8.
Workarounds
Limit access to action invocation endpoints to trusted service callers until upgrading.
What to do
Upgrade @backstage/backend-defaults to version 0.17.8 or later. If upgrading immediately is not feasible, restrict access to action invocation endpoints to trusted service callers.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @backstage/backend-defaults | < 0.17.8 | 0.17.8 |
References
- https://github.com/backstage/backstage/security/advisories/GHSA-3xr5-8w6c-p5gw
- https://nvd.nist.gov/vuln/detail/CVE-2026-106495
- https://github.com/backstage/backstage/commit/a8fb34a990a69bcb745e85a3213cf9e5ba2d31a3
- https://github.com/backstage/backstage
- https://github.com/backstage/backstage/releases/tag/v1.54.6
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N- Weakness (CWE)
CWE-284- Platform
- npm
- Package
@backstage/backend-defaults- Disclosed
- 15.10.2026
- Updated
- 19.10.2026 08:00
Sources and licenses · Edited or translated by DockRay; source rights and applicable licenses are retained.
OSV / GitHub Advisory Database - GHSA-3xr5-8w6c-p5gw - CC BY 4.0
Vulnerability history: @backstage/backend-defaults
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 6
- First → latest
- 01.2026 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 2
- Medium 2
- Low 2
Disclosures per year
- 2026: 6
-
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