All vulnerabilities
CVE-2026-106458GHSA-c36c-cf6r-ghgj

Backstage: Inconsistent repository filtering in Bitbucket Server catalog event updates

backstage @backstage/plugin-catalog-backend-module-bitbucket-servernpmApplications & CMS
Open in ThreatlineRecord JSON
CVSS
6.5Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.27%Chance of exploitation activity in the next 30 days, higher than 17% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in0.5.15Fixed versionGitHub
Published6 Oct 2026Updated 7 Oct 2026CVE List

What fixes it

  • 0.5.15@backstage/plugin-catalog-backend-module-bitbucket-server, npmGitHubnpm install @backstage/plugin-catalog-backend-module-bitbucket-server@0.5.15

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

Impact

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 can cause catalog entities and metadata to be ingested from a repository that the operator did not intend to trust.

Deployments that do not enable event support for the Bitbucket Server catalog provider, do not configure repository filters, or whose integration credentials cannot read the filtered-out repositories are not affected.

Patches

Upgrade @backstage/plugin-catalog-backend-module-bitbucket-server to version 0.5.15 or later. The fixed package is available in Backstage v1.55.0.

Workarounds

  • Disable event-driven updates for the Bitbucket Server catalog provider and rely on scheduled discovery until the patched package is deployed.
  • Restrict the configured Bitbucket Server integration credentials so that they cannot read repositories that must remain outside the catalog trust boundary.

Text from GitHub Advisory Database

Affected versions 4

  • @backstage/plugin-catalog-backend-module-bitbucket-server, npm>= 0.4.0, < 0.5.15GitHub
  • backstageaffected: >= 1.38.0, < 1.55.0CVE List
  • plugin-catalog-backend-module-bitbucket-serveraffected: >= 0.4.0, < 0.5.15CVE List
  • @backstage/plugin-catalog-backend-module-bitbucket-server, npmfrom 0.4.0, fixed in 0.5.15OSV

References 5