CVE-2026-106458: @backstage Plugin-Catalog-Backend-Module-Bitbucket-Server

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

Backstage is an open framework for building developer portals. From 0.4.0 until 0.5.15, the @backstage/plugin-catalog-backend-module-bitbucket-server package is affected by inconsistent repository filtering in bitbucket server catalog event updates. Deployments using event-driven updates in the Bitbucket Server catalog provider may ingest catalog locations from repositories that are excluded by the provider's configured project, repository, or archived-repository filters. An authenticated Bitbucket Server user who can push to a filtered-out repository that remains readable by the configured Backstage integration can trigger a legitimate repository event. The affected event path may then add a Location for that repository even though scheduled discovery excludes it. This issue is fixed in version 0.5.15.

Affected products

• @backstage Plugin-Catalog-Backend-Module-Bitbucket-Server: from 0.4.0, before 0.5.15 (fixed in 0.5.15)
• Backstage Backstage: from 1.38.0, before 1.55.0 (fixed in 1.55.0)

Published 2026-10-06. Last modified 2026-10-07.