All vulnerabilities
CVE-2026-106462GHSA-29gx-h2m3-xw44

@backstage/plugin-scaffolder-backend: Backstage's scaffolder credential handling may allow unintended GitHub authentication fallback

backstage @backstage/plugin-scaffolder-backendnpmLibraries & packages
Open in ThreatlineRecord JSON
CVSS
6.4Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.17%Chance of exploitation activity in the next 30 days, higher than 6% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in4.1.0Also 0.9.13, 0.11.10 and 2 moreGitHub
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
  • 0.9.13@backstage/plugin-scaffolder-backend-module-github, npmGitHubnpm install @backstage/plugin-scaffolder-backend-module-github@0.9.13
  • 0.11.10@backstage/plugin-scaffolder-backend-module-gitlab, npmGitHubnpm install @backstage/plugin-scaffolder-backend-module-gitlab@0.11.10
  • 0.2.25@backstage/plugin-scaffolder-backend-module-azure, npmGitHubnpm install @backstage/plugin-scaffolder-backend-module-azure@0.2.25
  • 0.3.10@backstage/plugin-scaffolder-backend-module-bitbucket-cloud, npmGitHubnpm install @backstage/plugin-scaffolder-backend-module-bitbucket-cloud@0.3.10
  • 0.2.25@backstage/plugin-scaffolder-backend-module-bitbucket-server, npmGitHubnpm install @backstage/plugin-scaffolder-backend-module-bitbucket-server@0.2.25

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

Scaffolder actions that interact with source control systems may not consistently enforce the intended credential boundaries under certain configurations. An authenticated user could perform operations with broader access than intended.

Patches

  • @backstage/plugin-scaffolder-backend version 4.1.0
  • @backstage/plugin-scaffolder-backend-module-azure version 0.2.25
  • @backstage/plugin-scaffolder-backend-module-bitbucket-cloud version 0.3.10
  • @backstage/plugin-scaffolder-backend-module-bitbucket-server version 0.2.25
  • @backstage/plugin-scaffolder-backend-module-github version 0.9.13
  • @backstage/plugin-scaffolder-backend-module-gitlab version 0.11.10

The fix introduces a new configuration option that enforces user-provided credentials for supported SCM actions. The new behavior is opt-in for compatibility. After upgrading, set:

scaffolder:
  requireScmUserCredentials: true

Before enabling this setting, review and update your templates as described in the software templates documentation referred to below.

Workarounds

If you cannot upgrade and enable the setting immediately:

  • Restrict who can create Scaffolder tasks and which templates they can execute.
  • Limit SCM integration credentials to the minimum repository read and mutation permissions required.
  • Remove integration credentials for SCM hosts where all required operations can use explicitly supplied user tokens.

Text from GitHub Advisory Database

Affected versions 19

  • @backstage/plugin-scaffolder-backend, npm< 4.1.0GitHub
  • @backstage/plugin-scaffolder-backend-module-github, npm< 0.9.13GitHub
  • @backstage/plugin-scaffolder-backend-module-gitlab, npm< 0.11.10GitHub
  • @backstage/plugin-scaffolder-backend-module-azure, npm< 0.2.25GitHub
  • @backstage/plugin-scaffolder-backend-module-bitbucket-cloud, npm< 0.3.10GitHub
  • @backstage/plugin-scaffolder-backend-module-bitbucket-server, npm< 0.2.25GitHub
  • backstageaffected: < 1.54.6CVE List
  • plugin-scaffolder-backendaffected: < 4.1.0CVE List
  • plugin-scaffolder-backend-module-azureaffected: < 0.2.25CVE List
  • plugin-scaffolder-backend-module-bitbucket-cloudaffected: < 0.3.10CVE List
  • plugin-scaffolder-backend-module-bitbucket-serveraffected: < 0.2.25CVE List
  • plugin-scaffolder-backend-module-githubaffected: < 0.9.13CVE List
  • plugin-scaffolder-backend-module-gitlabaffected: < 0.11.10CVE List
  • @backstage/plugin-scaffolder-backend, npmfrom first release, fixed in 4.1.0OSV
  • @backstage/plugin-scaffolder-backend-module-github, npmfrom first release, fixed in 0.9.13OSV
  • @backstage/plugin-scaffolder-backend-module-gitlab, npmfrom first release, fixed in 0.11.10OSV
  • @backstage/plugin-scaffolder-backend-module-azure, npmfrom first release, fixed in 0.2.25OSV
  • @backstage/plugin-scaffolder-backend-module-bitbucket-cloud, npmfrom first release, fixed in 0.3.10OSV
  • @backstage/plugin-scaffolder-backend-module-bitbucket-server, npmfrom first release, fixed in 0.2.25OSV

References 6