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[ CVE-2026-106498 · Published 6 Oct 2026 ]

Backstage: Improper URL validation in catalog entity placeholder resolution

CVSS 7.7 EPSS <1%Fix available

[ Description ]Official description

Backstage is an open framework for building developer portals. Prior to 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1, the @backstage/plugin-catalog-backend package is affected by improper url validation in catalog entity placeholder resolution. An authenticated Backstage user could craft a catalog entity with placeholder directives that reference resources outside the entity's source repository. Under certain configurations, this could allow access to data not intended to be available to the user. This issue is fixed in versions 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1.

[ Fixes ]Fixes and patches

[ Packages ]Affected open-source packages

  • @backstage/plugin-catalog-backend npmAffected < 3.9.1 · fixed in 3.9.1 · GHSA-qgvj-qcf8-xq73

[ References ]References