{"schema":"threatline.record/2","record":{"id":"CVE-2026-106503","aliases":["GHSA-hmp2-4m7g-22cv"],"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.","categories":["Libraries & packages"],"product":"@backstage/plugin-scaffolder-backend","vendor":"backstage","ecosystem":"npm","affected_ranges":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-hmp2-4m7g-22cv","source_modified_at":"2026-10-07T17:59:09Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend"},"range":"< 3.3.1"},{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-hmp2-4m7g-22cv","source_modified_at":"2026-10-07T17:59:09Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend"},"range":">= 3.4.0, < 3.4.1"},{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-hmp2-4m7g-22cv","source_modified_at":"2026-10-07T17:59:09Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend"},"range":">= 4.0.0, < 4.0.3"},{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-hmp2-4m7g-22cv","source_modified_at":"2026-10-07T17:59:09Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend"},"range":">= 4.0.4, < 4.1.0"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-106503","source_modified_at":"2026-10-09T01:55:54.101Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"backstage","vendor":"backstage","versions":[{"version":"< 1.49.6","status":"affected"},{"version":">= 1.50.0-next.0, < 1.50.5","status":"affected"},{"version":">= 1.51.0-next.0, < 1.54.6","status":"affected"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-106503","source_modified_at":"2026-10-09T01:55:54.101Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"plugin-scaffolder-backend","vendor":"@backstage","versions":[{"version":"< 3.3.1","status":"affected"},{"version":">= 3.4.0, < 3.4.1","status":"affected"},{"version":">= 4.0.0, < 4.0.3","status":"affected"},{"version":">= 4.0.4, < 4.1.0","status":"affected"}],"defaultStatus":null},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-hmp2-4m7g-22cv","source_modified_at":"2026-10-07T18:15:12.169871159Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend","purl":"pkg:npm/%40backstage/plugin-scaffolder-backend"},"ranges":[{"events":[{"introduced":"0"},{"fixed":"3.3.1"}],"type":"SEMVER"}],"versions":[]},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-hmp2-4m7g-22cv","source_modified_at":"2026-10-07T18:15:12.169871159Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend","purl":"pkg:npm/%40backstage/plugin-scaffolder-backend"},"ranges":[{"events":[{"introduced":"3.4.0"},{"fixed":"3.4.1"}],"type":"SEMVER"}],"versions":[]},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-hmp2-4m7g-22cv","source_modified_at":"2026-10-07T18:15:12.169871159Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend","purl":"pkg:npm/%40backstage/plugin-scaffolder-backend"},"ranges":[{"events":[{"introduced":"4.0.0"},{"fixed":"4.0.3"}],"type":"SEMVER"}],"versions":[]},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-hmp2-4m7g-22cv","source_modified_at":"2026-10-07T18:15:12.169871159Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend","purl":"pkg:npm/%40backstage/plugin-scaffolder-backend"},"ranges":[{"events":[{"introduced":"4.0.4"},{"fixed":"4.1.0"}],"type":"SEMVER"}],"versions":[]}],"fixed_versions":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-hmp2-4m7g-22cv","source_modified_at":"2026-10-07T17:59:09Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend"},"version":"3.3.1"},{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-hmp2-4m7g-22cv","source_modified_at":"2026-10-07T17:59:09Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend"},"version":"3.4.1"},{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-hmp2-4m7g-22cv","source_modified_at":"2026-10-07T17:59:09Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend"},"version":"4.0.3"},{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-hmp2-4m7g-22cv","source_modified_at":"2026-10-07T17:59:09Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend"},"version":"4.1.0"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-hmp2-4m7g-22cv","source_modified_at":"2026-10-07T18:15:12.169871159Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend","purl":"pkg:npm/%40backstage/plugin-scaffolder-backend"},"version":"3.3.1"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-hmp2-4m7g-22cv","source_modified_at":"2026-10-07T18:15:12.169871159Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend","purl":"pkg:npm/%40backstage/plugin-scaffolder-backend"},"version":"3.4.1"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-hmp2-4m7g-22cv","source_modified_at":"2026-10-07T18:15:12.169871159Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend","purl":"pkg:npm/%40backstage/plugin-scaffolder-backend"},"version":"4.0.3"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-hmp2-4m7g-22cv","source_modified_at":"2026-10-07T18:15:12.169871159Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend","purl":"pkg:npm/%40backstage/plugin-scaffolder-backend"},"version":"4.1.0"}],"cvss":8.1,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00382,"percentile":0.31037,"score_date":"2026-10-23"},"published_at":"2026-10-06T21:37:33.675Z","modified_at":"2026-10-09T01:55:54.101Z","provenance":[{"source":"GitHub Advisory Database","url":"https://github.com/advisories/GHSA-hmp2-4m7g-22cv","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-07T17:59:09Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-106503","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-09T01:55:54.101Z"},{"source":"OSV","url":"https://osv.dev/vulnerability/GHSA-hmp2-4m7g-22cv","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-07T18:15:12.169871159Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-106503","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["GitHub Advisory Database","CVE List","OSV","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/backstage/backstage/security/advisories/GHSA-hmp2-4m7g-22cv","tags":["x_refsource_CONFIRM"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-106503","source":"GitHub Advisory Database"},{"source":"CVE List","url":"https://github.com/backstage/backstage/commit/11c1384c0649b8ab26391c6a4e4f34b80ab0d188","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/backstage/backstage/commit/a91ed72d540e80b62a73b39bb1563ff5018d52d1","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/backstage/backstage/commit/e307e4f487103d815e484291b3fda778ab9983bf","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/backstage/backstage/releases/tag/v1.49.6","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/backstage/backstage/releases/tag/v1.50.5","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/backstage/backstage/releases/tag/v1.54.6","tags":["x_refsource_MISC"]},{"url":"https://github.com/advisories/GHSA-hmp2-4m7g-22cv","source":"GitHub Advisory Database"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"total","assessed_at":"2026-10-09T01:55:45.447568Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"ecosystem","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-09T01:55:54.101Z","content_hash":"f4acd61b90bd39620359d68f1dc8fe18cf6bf36cfe486489c11d2baaa86d70fe"}}