{"cve":"CVE-2026-106503","nvd":{"published":"2026-10-06T22:17:05.513","modified":"2026-10-13T14:37:56.910","status":"Analyzed","description":"Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by scaffolder action input authorization bypass. An 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. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","score":8.1},"cwes":["CWE-178","CWE-284"],"references":["https://github.com/backstage/backstage/commit/11c1384c0649b8ab26391c6a4e4f34b80ab0d188","https://github.com/backstage/backstage/commit/a91ed72d540e80b62a73b39bb1563ff5018d52d1","https://github.com/backstage/backstage/commit/e307e4f487103d815e484291b3fda778ab9983bf","https://github.com/backstage/backstage/releases/tag/v1.49.6","https://github.com/backstage/backstage/releases/tag/v1.50.5"],"products":["linuxfoundation:backstage","linuxfoundation:backstage\\/plugin-scaffolder-backend"],"source":"nvd","synced_at":"2026-10-19T22:58:01.639778232+00:00"},"epss":{"cve":"CVE-2026-106503","score":0.00391,"percentile":0.32945,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-hmp2-4m7g-22cv","url":"https://osv.dev/vulnerability/GHSA-hmp2-4m7g-22cv","summary":"Backstage: Scaffolder action input authorization bypass","modified":"2026-10-07T18:15:12.169871159Z","packages":[{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend","purl":"pkg:npm/%40backstage/plugin-scaffolder-backend","ranges":["<3.3.1"],"fixed":["3.3.1"]},{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend","purl":"pkg:npm/%40backstage/plugin-scaffolder-backend","ranges":[">=3.4.0 <3.4.1"],"fixed":["3.4.1"]},{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend","purl":"pkg:npm/%40backstage/plugin-scaffolder-backend","ranges":[">=4.0.0 <4.0.3"],"fixed":["4.0.3"]},{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend","purl":"pkg:npm/%40backstage/plugin-scaffolder-backend","ranges":[">=4.0.4 <4.1.0"],"fixed":["4.1.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}