Skip to content
OpenAdvisories
High · 8.5 CVE-2026-106486 EUVD-2026-94003GHSA-g8rx-f7m5-7794

Backstage: Improper filesystem validation in Bitbucket pull-request scaffolder actions

Published Oct 6, 2026 · Updated Oct 7, 2026 · Assigned by GitHub_M

Description

Backstage is an open framework for building developer portals. Prior to 0.3.10 in @backstage/plugin-scaffolder-backend-module-bitbucket-cloud and 0.2.25 in @backstage/plugin-scaffolder-backend-module-bitbucket-server, the Bitbucket pull-request Scaffolder actions did not sufficiently validate filesystem paths. An authenticated user who can execute an eligible template and influence an allowed Bitbucket repository could affect paths outside the expected working area, potentially compromising backend confidentiality, integrity, or availability. This issue is fixed in @backstage/plugin-scaffolder-backend-module-bitbucket-cloud 0.3.10 and @backstage/plugin-scaffolder-backend-module-bitbucket-server 0.2.25.

Affected products

VendorProductAffectedFixed
backstage backstage < 1.54.6 —
@backstage plugin-scaffolder-backend-module-bitbucket-cloud < 0.3.10 —
@backstage plugin-scaffolder-backend-module-bitbucket-server < 0.2.25 —

Affected packages

References