{"id":"GHSA-3xr5-8w6c-p5gw","summary":"Backstage: Improper access control in backend action invocation","details":"### Impact\n\nAn authenticated user could invoke actions that an operator had excluded through action configuration. Existing action permissions and downstream authorization remain enforced.\n\n### Patches\n\nPatched in `@backstage/backend-defaults` version `0.17.8`\n\n### Workarounds\n\nLimit access to action invocation endpoints to trusted service callers until upgrading.","aliases":["CVE-2026-106495"],"modified":"2026-10-15T20:30:06.250180939Z","published":"2026-10-15T20:21:54Z","database_specific":{"cwe_ids":["CWE-284"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-10-15T20:21:54Z","nvd_published_at":"2026-10-12T21:17:08Z"},"references":[{"type":"WEB","url":"https://github.com/backstage/backstage/security/advisories/GHSA-3xr5-8w6c-p5gw"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-106495"},{"type":"WEB","url":"https://github.com/backstage/backstage/commit/a8fb34a990a69bcb745e85a3213cf9e5ba2d31a3"},{"type":"PACKAGE","url":"https://github.com/backstage/backstage"},{"type":"WEB","url":"https://github.com/backstage/backstage/releases/tag/v1.54.6"}],"affected":[{"package":{"name":"@backstage/backend-defaults","ecosystem":"npm","purl":"pkg:npm/%40backstage/backend-defaults"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.17.8"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-3xr5-8w6c-p5gw/GHSA-3xr5-8w6c-p5gw.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"}]}