All vulnerabilities
CVE-2026-106459GHSA-g734-fhp4-7mfp

Backstage: Improper input validation in Sentry scaffolder actions

backstage @backstage/plugin-scaffolder-backend-module-sentrynpmLibraries & packages
Open in ThreatlineRecord JSON
CVSS
8.5High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.21%Chance of exploitation activity in the next 30 days, higher than 10% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in0.3.8Fixed versionGitHub
Published6 Oct 2026Updated 7 Oct 2026CVE List

What fixes it

  • 0.3.8@backstage/plugin-scaffolder-backend-module-sentry, npmGitHubnpm install @backstage/plugin-scaffolder-backend-module-sentry@0.3.8

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 internal user who can execute the affected actions may cause the backend to contact unintended destinations and disclose Sentry integration credentials. Subsequent impact depends on network reachability and the privileges granted to the configured token.

Patches

Upgrade @backstage/plugin-scaffolder-backend-module-sentry to version 0.3.8 or later. The fixed package is available in Backstage v1.54.8 and Backstage v1.55.0.

The update removes custom action-level apiBaseUrl values. Move any such value to scaffolder.sentry.apiBaseUrl before upgrading.

Workarounds

  • Disable the affected actions until the patched package is deployed.
  • Restrict scaffolder.action.execute permission for the affected Sentry actions to trusted users and templates.

Text from GitHub Advisory Database

Affected versions 4

  • @backstage/plugin-scaffolder-backend-module-sentry, npm>= 0.3.0, < 0.3.8GitHub
  • backstageaffected: >= 1.47.0, < 1.54.8CVE List
  • plugin-scaffolder-backend-module-sentryaffected: >= 0.3.0, < 0.3.8CVE List
  • @backstage/plugin-scaffolder-backend-module-sentry, npmfrom 0.3.0, fixed in 0.3.8OSV

References 6