[ CVE-2026-106495 · Published 12 Oct 2026 ]
Backstage: Improper access control in backend action invocation
CVSS 4.3
EPSS <1%Fix available
[ Description ]Official description
Backstage is an open framework for building developer portals. Prior to 0.17.8, the @backstage/backend-defaults package is affected by improper access control in backend action invocation. An authenticated user could invoke actions that an operator had excluded through action configuration. Existing action permissions and downstream authorization remain enforced. This issue is fixed in version 0.17.8.
[ Fixes ]Fixes and patches
- @backstage/backend-defaults 0.17.8Fixed version · GitHub Advisories · npm package @backstage/backend-defaults: upgrade to 0.17.8 or later (affected < 0.17.8)
[ Packages ]Affected open-source packages
- @backstage/backend-defaults npmAffected < 0.17.8 · fixed in 0.17.8 · GHSA-3xr5-8w6c-p5gw