{"schema":"threatline.record/2","record":{"id":"CVE-2026-106492","aliases":["GHSA-cq7v-rfgc-5c7v"],"summary":"Backstage: Improper preservation of access restrictions during service credential delegation","details":"### Impact\n\nAn external service credential configured with access restrictions (e.g., read-only) could bypass those restrictions by routing requests through plugin delegation paths. This could allow a restricted service to perform operations beyond its intended scope, including write operations on plugins it was restricted to read-only access for.\n\n### Patches\n\nPatched in `@backstage/backend-defaults` version `0.17.8`\n\n### Workarounds\n\nIf you're unable to upgrade immediately:\n\n- If practical, replace restricted credentials with separate, purpose-specific unrestricted credentials scoped to trusted consumers.\n- Restrict network-level access to Backstage backend API endpoints to trusted callers only.","categories":["Libraries & packages"],"product":"@backstage/backend-defaults","vendor":"backstage","ecosystem":"npm","affected_ranges":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-cq7v-rfgc-5c7v","source_modified_at":"2026-10-07T17:59:45Z","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-2026-106492","source_modified_at":"2026-10-09T01:51:07.252Z","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, < 1.54.6","status":"affected"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-106492","source_modified_at":"2026-10-09T01:51:07.252Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"backend-defaults","vendor":"@backstage","versions":[{"version":"< 0.16.1","status":"affected"},{"version":">= 0.17.0, < 0.17.8","status":"affected"}],"defaultStatus":null},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-cq7v-rfgc-5c7v","source_modified_at":"2026-10-07T18:15:11.766063944Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/backend-defaults","purl":"pkg:npm/%40backstage/backend-defaults"},"ranges":[{"events":[{"introduced":"0"},{"fixed":"0.17.8"}],"type":"SEMVER"}],"versions":[]}],"fixed_versions":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-cq7v-rfgc-5c7v","source_modified_at":"2026-10-07T17:59:45Z","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-cq7v-rfgc-5c7v","source_modified_at":"2026-10-07T18:15:11.766063944Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/backend-defaults","purl":"pkg:npm/%40backstage/backend-defaults"},"version":"0.17.8"}],"cvss":7.6,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00208,"percentile":0.10321,"score_date":"2026-10-23"},"published_at":"2026-10-06T20:48:05.896Z","modified_at":"2026-10-09T01:51:07.252Z","provenance":[{"source":"GitHub Advisory Database","url":"https://github.com/advisories/GHSA-cq7v-rfgc-5c7v","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-07T17:59:45Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-106492","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-09T01:51:07.252Z"},{"source":"OSV","url":"https://osv.dev/vulnerability/GHSA-cq7v-rfgc-5c7v","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-07T18:15:11.766063944Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-106492","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-cq7v-rfgc-5c7v","tags":["x_refsource_CONFIRM"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-106492","source":"GitHub Advisory Database"},{"source":"CVE List","url":"https://github.com/backstage/backstage/commit/40346245c53e1bf26dee56601e95c5c4ab9cc124","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/backstage/backstage/commit/bc80ffdafbc92ff7b8c72347eace13cb8688fd33","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/v1.54.6","tags":["x_refsource_MISC"]},{"url":"https://github.com/advisories/GHSA-cq7v-rfgc-5c7v","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":"2026-10-09T01:50:58.091263Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"ecosystem","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-09T01:51:07.252Z","content_hash":"562d779a5050a1c74898ad78b9e27811ab8ff6496f908ac35a35447e64482d97"}}