All vulnerabilities
CVE-2026-106504GHSA-4xvq-3m68-h444

@backstage/plugin-scaffolder-backend: Backstage has sensitive information exposure in scaffolder task logs

backstage @backstage/plugin-scaffolder-backendnpmLibraries & packages
Open in ThreatlineRecord JSON
CVSS
6.5Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.26%Chance of exploitation activity in the next 30 days, higher than 16% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in4.1.0Fixed versionGitHub
Published6 Oct 2026Updated 7 Oct 2026CVE List

What fixes it

  • 4.1.0@backstage/plugin-scaffolder-backend, npmGitHubnpm install @backstage/plugin-scaffolder-backend@4.1.0

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 who can create and read scaffolder tasks may be able to observe sensitive values in task logs in deployments with restrictive action permissions and affected templates. Exploitation requires a denied action whose input contains such a value.

Patches

Patched in @backstage/plugin-scaffolder-backend version 4.1.0

Workarounds

  • Restrict scaffolder task creation and task-log reading to trusted users.
  • Avoid placing centrally managed sensitive values in inputs to actions that may be denied until upgrading.

References

Text from GitHub Advisory Database

Affected versions 4

  • @backstage/plugin-scaffolder-backend, npm< 4.1.0GitHub
  • backstageaffected: < 1.54.6CVE List
  • plugin-scaffolder-backendaffected: < 4.1.0CVE List
  • @backstage/plugin-scaffolder-backend, npmfrom first release, fixed in 4.1.0OSV

References 5