All vulnerabilities
CVE-2026-106495GHSA-3xr5-8w6c-p5gw

@backstage/backend-defaults: Backstage: Improper access control in backend action invocation

backstage @backstage/backend-defaultsnpmLibraries & packages
Open in ThreatlineRecord JSON
CVSS
4.3Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.24%Chance of exploitation activity in the next 30 days, higher than 14% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in0.17.8Fixed versionGitHub
Published12 Oct 2026Updated 15 Oct 2026CVE List

What fixes it

  • 0.17.8@backstage/backend-defaults, npmGitHubnpm install @backstage/backend-defaults@0.17.8

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

An authenticated user could invoke actions that an operator had excluded through action configuration. Existing action permissions and downstream authorization remain enforced.

Patches

Patched in @backstage/backend-defaults version 0.17.8

Workarounds

Limit access to action invocation endpoints to trusted service callers until upgrading.

Text from GitHub Advisory Database

Affected versions 4

  • @backstage/backend-defaults, npm< 0.17.8GitHub
  • backstageaffected: < 1.54.6CVE List
  • backend-defaultsaffected: < 0.17.8CVE List
  • @backstage/backend-defaults, npmfrom first release, fixed in 0.17.8OSV

References 5