[ CVE-2026-106494 · Published 6 Oct 2026 ]
Backstage: Improper input validation in cloud storage URL readers
CVSS 4.9
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 input validation in cloud storage url readers. An attacker with write access to a cloud storage bucket used by Backstage could craft object names that could collide with protected files in the output directory. In certain deployment configurations, this could lead to content injection. 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)
- Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
- Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
[ Packages ]Affected open-source packages
- @backstage/backend-defaults npmAffected < 0.17.8 · fixed in 0.17.8 · GHSA-7649-wm97-w3j3