{"id":"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.","aliases":["CVE-2026-106492"],"modified":"2026-10-07T18:15:11.766063944Z","published":"2026-10-07T17:59:43Z","database_specific":{"cwe_ids":["CWE-269","CWE-863"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-10-07T17:59:43Z","nvd_published_at":"2026-10-06T21:17:18Z"},"references":[{"type":"WEB","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":"WEB","url":"https://github.com/backstage/backstage/commit/40346245c53e1bf26dee56601e95c5c4ab9cc124"},{"type":"WEB","url":"https://github.com/backstage/backstage/commit/bc80ffdafbc92ff7b8c72347eace13cb8688fd33"},{"type":"PACKAGE","url":"https://github.com/backstage/backstage"},{"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"}],"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-cq7v-rfgc-5c7v/GHSA-cq7v-rfgc-5c7v.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:L/I:H/A:L"}]}