{"schema":"threatline.record/2","record":{"id":"CVE-2026-106495","aliases":["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.","categories":["Libraries & packages"],"product":"@backstage/backend-defaults","vendor":"backstage","ecosystem":"npm","affected_ranges":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-3xr5-8w6c-p5gw","source_modified_at":"2026-10-15T20:21:56Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/backend-defaults"},"range":"< 0.17.8"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-106495","source_modified_at":"2026-10-13T14:57:21.381Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"backstage","vendor":"backstage","versions":[{"version":"< 1.54.6","status":"affected"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-106495","source_modified_at":"2026-10-13T14:57:21.381Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"backend-defaults","vendor":"@backstage","versions":[{"version":"< 0.17.8","status":"affected"}],"defaultStatus":null},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-3xr5-8w6c-p5gw","source_modified_at":"2026-10-15T20:30:06.250180939Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"@backstage/backend-defaults","ecosystem":"npm","purl":"pkg:npm/%40backstage/backend-defaults"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.17.8"}]}],"versions":[]}],"fixed_versions":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-3xr5-8w6c-p5gw","source_modified_at":"2026-10-15T20:21:56Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/backend-defaults"},"version":"0.17.8"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-3xr5-8w6c-p5gw","source_modified_at":"2026-10-15T20:30:06.250180939Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"@backstage/backend-defaults","ecosystem":"npm","purl":"pkg:npm/%40backstage/backend-defaults"},"version":"0.17.8"}],"cvss":4.3,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00238,"percentile":0.14068,"score_date":"2026-10-23"},"published_at":"2026-10-12T20:11:07.680Z","modified_at":"2026-10-15T20:30:06.250180939Z","provenance":[{"source":"GitHub Advisory Database","url":"https://github.com/advisories/GHSA-3xr5-8w6c-p5gw","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-15T20:21:56Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-106495","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-13T14:57:21.381Z"},{"source":"OSV","url":"https://osv.dev/vulnerability/GHSA-3xr5-8w6c-p5gw","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-15T20:30:06.250180939Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-106495","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-3xr5-8w6c-p5gw","tags":["x_refsource_CONFIRM"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-106495","source":"GitHub Advisory Database"},{"source":"CVE List","url":"https://github.com/backstage/backstage/commit/a8fb34a990a69bcb745e85a3213cf9e5ba2d31a3","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-3xr5-8w6c-p5gw","source":"GitHub Advisory Database"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"partial","assessed_at":"2026-10-13T14:57:13.322541Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"ecosystem","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-15T20:30:06.250180939Z","content_hash":"48d57eb67ed7ccc9ed539ea3699a06a18aa9a925e62901508825dc3154625c71"}}