Vulnerability · Published Oct 6, 2026 · Assigned by GitHub_M
CVE-2026-106462Backstage: Scaffolder credential handling may allow unintended GitHub authentication fallback
Medium 6.4
In plain English
A medium-severity incorrect authorization in backstage from backstage. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Backstage is an open framework for building developer portals. Prior to 1.54.6, scaffolder source-control actions may not consistently enforce intended credential boundaries. An authenticated user could cause an affected action to fall back to broader integration credentials and perform operations with more access than intended. This issue is fixed in 1.54.6 when operators also enable scaffolder.requireScmUserCredentials after upgrading.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @backstage/plugin-scaffolder-backend | 4.1.0 | GHSA-29gx-h2m3-xw44 |
| npm | @backstage/plugin-scaffolder-backend-module-azure | 0.2.25 | GHSA-29gx-h2m3-xw44 |
| npm | @backstage/plugin-scaffolder-backend-module-bitbucket-cloud | 0.3.10 | GHSA-29gx-h2m3-xw44 |
| npm | @backstage/plugin-scaffolder-backend-module-bitbucket-server | 0.2.25 | GHSA-29gx-h2m3-xw44 |
| npm | @backstage/plugin-scaffolder-backend-module-github | 0.9.13 | GHSA-29gx-h2m3-xw44 |
| npm | @backstage/plugin-scaffolder-backend-module-gitlab | 0.11.10 | GHSA-29gx-h2m3-xw44 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| backstage | backstage | < 1.54.6 |
| @backstage | plugin-scaffolder-backend | < 4.1.0 |
| @backstage | plugin-scaffolder-backend-module-azure | < 0.2.25 |
| @backstage | plugin-scaffolder-backend-module-bitbucket-cloud | < 0.3.10 |
| @backstage | plugin-scaffolder-backend-module-bitbucket-server | < 0.2.25 |
| @backstage | plugin-scaffolder-backend-module-github | < 0.9.13 |
| @backstage | plugin-scaffolder-backend-module-gitlab | < 0.11.10 |
Weakness: CWE-441, CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N