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Exploitation requires a denied action whose input contains such a value.\n\n### Patches\n\nPatched in `@backstage/plugin-scaffolder-backend` version `4.1.0`\n\n### Workarounds\n\n- Restrict scaffolder task creation and task-log reading to trusted users.\n- Avoid placing centrally managed sensitive values in inputs to actions that may be denied until upgrading.\n\n### References\n\n- [Backstage threat model](https://backstage.io/docs/overview/threat-model/)\n- [Backstage permissions overview](https://backstage.io/docs/permissions/overview/)","state":0,"publishedAt":"2026-10-07T16:24:29+00:00","modifiedAt":"2026-10-07T16:30:05.290353+00:00","affected":[{"ecosystem":"npm","name":"@backstage/plugin-scaffolder-backend","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"4.1.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/backstage/backstage/security/advisories/GHSA-4xvq-3m68-h444","https://nvd.nist.gov/vuln/detail/CVE-2026-106504","https://github.com/backstage/backstage/commit/3eb3dc59eb0da0deccd532f19eb460bb452c9efb","https://github.com/backstage/backstage","https://github.com/backstage/backstage/releases/tag/v1.54.6"],"sourceUrl":"https://github.com/advisories/GHSA-4xvq-3m68-h444","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-4xvq-3m68-h444","identifiers":["GHSA-4xvq-3m68-h444","CVE-2026-106504"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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