Path Traversal in @backstage/plugin-scaffolder-backend
Description
Backstage is an open platform for building developer portals. In affected versions A malicious actor could read sensitive files from the environment where Scaffolder Tasks are run. The attack is executed by crafting a custom Scaffolder template with a github:publish:pull-request action and a particular source path. When the template is executed the sensitive files would be included in the published pull request. This vulnerability is mitigated by the fact that an attacker would need access to create and register templates in the Backstage catalog, and that the attack is very visible given that the exfiltration happens via a pull request. The vulnerability is patched in the 0.15.9 release of @backstage/plugin-scaffolder-backend.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
@backstage/plugin-scaffolder-backendnpm | >= 0.9.4, < 0.15.9 | 0.15.9 |
Affected products
1Patches
16968962c9205scaffolder-backend: release path traversal fix
3 files changed · +8 −7
.changeset/stale-poets-destroy.md+0 −6 removed@@ -1,6 +0,0 @@ ---- -'@backstage/plugin-scaffolder-backend': patch ---- - -Make sure `sourcePath` of `publish:github:pull-request` can only be used to -retrieve files from the workspace.
plugins/scaffolder-backend/CHANGELOG.md+7 −0 modified@@ -1,5 +1,12 @@ # @backstage/plugin-scaffolder-backend +## 0.15.9 + +### Patch Changes + +- 0f99f1170e: Make sure `sourcePath` of `publish:github:pull-request` can only be used to + retrieve files from the workspace. + ## 0.15.8 ### Patch Changes
plugins/scaffolder-backend/package.json+1 −1 modified@@ -1,7 +1,7 @@ { "name": "@backstage/plugin-scaffolder-backend", "description": "The Backstage backend plugin that helps you create new things", - "version": "0.15.8", + "version": "0.15.9", "main": "src/index.ts", "types": "src/index.ts", "license": "Apache-2.0",
Vulnerability mechanics
Generated by null/stub on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.
References
5- github.com/advisories/GHSA-pvv8-8fx9-h673ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2021-41151ghsaADVISORY
- github.com/backstage/backstage/commit/6968962c920508eae19a4c1c200fa2c8980a4006ghsax_refsource_MISCWEB
- github.com/backstage/backstage/releases/tag/release-2021-10-16ghsaWEB
- github.com/backstage/backstage/security/advisories/GHSA-pvv8-8fx9-h673ghsax_refsource_CONFIRMWEB
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