All vulnerabilities
CVE-2026-106497GHSA-8429-xpcj-3cg5

Backstage: Inconsistent catalog property permission evaluation

backstage backstage
Open in ThreatlineRecord JSON
CVSS
4.3Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.19%Chance of exploitation activity in the next 30 days, higher than 8% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in3.9.1Fixed versionGitHub
Published6 Oct 2026Updated 7 Oct 2026CVE List

What fixes it

  • 3.9.1@backstage/plugin-catalog-backend, npmGitHubnpm install @backstage/plugin-catalog-backend@3.9.1

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

Description

Backstage is an open framework for building developer portals. Prior to 3.9.1, the @backstage/plugin-catalog-backend package is affected by inconsistent catalog property permission evaluation. In deployments that use affected value-based catalog permission conditions as a confidentiality boundary, an authenticated user could receive catalog entity data that policy authors intended to restrict. This issue is fixed in version 3.9.1.

Text from CVE List

Affected versions 3

  • backstageaffected: < 1.54.6CVE List
  • plugin-catalog-backendaffected: < 3.9.1CVE List
  • @backstage/plugin-catalog-backend, npm< 3.9.1GitHub

References 3