{"id":"CVE-2026-106492","aliases":["GHSA-cq7v-rfgc-5c7v"],"url":"https://o3.security/vulnerability/CVE-2026-106492","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.","published":"2026-10-06T20:48:05.896Z","modified":"2026-10-21T02:54:35.309483342Z","cvss":{"score":7.6,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"@backstage/backend-defaults","fixedVersion":"0.17.8"}],"fix":{"url":"https://github.com/backstage/backstage/commit/40346245c53e1bf26dee56601e95c5c4ab9cc124","label":"backstage/backstage@4034624"},"references":[{"type":"WEB","url":"https://github.com/backstage/backstage/releases/tag/v1.49.6"},{"type":"WEB","url":"https://github.com/backstage/backstage/releases/tag/v1.54.6"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106492.json"},{"type":"ADVISORY","url":"https://github.com/backstage/backstage/security/advisories/GHSA-cq7v-rfgc-5c7v"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-106492"},{"type":"FIX","url":"https://github.com/backstage/backstage/commit/40346245c53e1bf26dee56601e95c5c4ab9cc124"},{"type":"FIX","url":"https://github.com/backstage/backstage/commit/bc80ffdafbc92ff7b8c72347eace13cb8688fd33"},{"type":"PACKAGE","url":"https://github.com/backstage/backstage"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-21T02:54:35.309483342Z"}}