{"schema_version":"1.9.0","id":"GHSA-hmp2-4m7g-22cv","published":"2026-10-07T17:59:08Z","modified":"2026-10-07T18:15:12.169871159Z","aliases":["CVE-2026-106503"],"summary":"Backstage: Scaffolder action input authorization bypass","details":"### Impact\n\nAn authenticated user with access to affected Scaffolder templates could bypass configured action restrictions. Depending on integration credentials, this could grant unauthorized access to repositories and related source-control resources.\n\n### Patches\n\nPatched in `@backstage/plugin-scaffolder-backend` version `4.1.0`\n\n### Workarounds\n\n- Restrict affected Scaffolder actions to trusted users and configure source-control integrations with least-privilege credentials.","affected":[{"package":{"name":"@backstage/plugin-scaffolder-backend","ecosystem":"npm","purl":"pkg:npm/%40backstage/plugin-scaffolder-backend"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.3.1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-hmp2-4m7g-22cv/GHSA-hmp2-4m7g-22cv.json"}},{"package":{"name":"@backstage/plugin-scaffolder-backend","ecosystem":"npm","purl":"pkg:npm/%40backstage/plugin-scaffolder-backend"},"ranges":[{"type":"SEMVER","events":[{"introduced":"3.4.0"},{"fixed":"3.4.1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-hmp2-4m7g-22cv/GHSA-hmp2-4m7g-22cv.json"}},{"package":{"name":"@backstage/plugin-scaffolder-backend","ecosystem":"npm","purl":"pkg:npm/%40backstage/plugin-scaffolder-backend"},"ranges":[{"type":"SEMVER","events":[{"introduced":"4.0.0"},{"fixed":"4.0.3"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-hmp2-4m7g-22cv/GHSA-hmp2-4m7g-22cv.json"}},{"package":{"name":"@backstage/plugin-scaffolder-backend","ecosystem":"npm","purl":"pkg:npm/%40backstage/plugin-scaffolder-backend"},"ranges":[{"type":"SEMVER","events":[{"introduced":"4.0.4"},{"fixed":"4.1.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-hmp2-4m7g-22cv/GHSA-hmp2-4m7g-22cv.json"}}],"references":[{"type":"WEB","url":"https://github.com/backstage/backstage/security/advisories/GHSA-hmp2-4m7g-22cv"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-106503"},{"type":"WEB","url":"https://github.com/backstage/backstage/commit/11c1384c0649b8ab26391c6a4e4f34b80ab0d188"},{"type":"WEB","url":"https://github.com/backstage/backstage/commit/a91ed72d540e80b62a73b39bb1563ff5018d52d1"},{"type":"WEB","url":"https://github.com/backstage/backstage/commit/e307e4f487103d815e484291b3fda778ab9983bf"},{"type":"PACKAGE","url":"https://github.com/backstage/backstage"},{"type":"WEB","url":"https://github.com/backstage/backstage/releases/tag/v1.49.6"},{"type":"WEB","url":"https://github.com/backstage/backstage/releases/tag/v1.50.5"},{"type":"WEB","url":"https://github.com/backstage/backstage/releases/tag/v1.54.6"}],"database_specific":{"cwe_ids":["CWE-178","CWE-284"],"github_reviewed":true,"github_reviewed_at":"2026-10-07T17:59:08Z","nvd_published_at":"2026-10-06T22:17:05Z","severity":"HIGH"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"}]}