{"id":"CVE-2026-106492","title":"Backstage is an open framework for building developer portals","summary":"Backstage is an open framework for building developer portals. Prior to 0.16.1 and 0.17.8, the @backstage/backend-defaults package is affected by improper preservation of access restrictions during service credential delegation. An exter…","severity":"high","cvss":7.6,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L","cwe":["CWE-269","CWE-863","CWE-281"],"vendor":"backstage","product":"backstage","affected":["backstage < 1.49.6","backstage >= 1.50.0-next.0, < 1.54.6","backend-defaults < 0.16.1","backend-defaults >= 0.17.0, < 0.17.8"],"published":"2026-10-06","updated":"2026-10-07","sourceUpdated":"2026-10-07T13:58:29.527","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-106492","references":[{"url":"https://github.com/backstage/backstage/commit/40346245c53e1bf26dee56601e95c5c4ab9cc124","label":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/commit/bc80ffdafbc92ff7b8c72347eace13cb8688fd33","label":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/releases/tag/v1.49.6","label":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/releases/tag/v1.54.6","label":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/security/advisories/GHSA-cq7v-rfgc-5c7v","label":"security-advisories@github.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106492.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-106492"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2547199"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-106492"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-106492"},{"url":"https://github.com/advisories/GHSA-cq7v-rfgc-5c7v"}],"tags":["nvd","cve.org","csaf","vex","red-hat","ghsa","npm"],"ingestedAt":"2026-10-06T21:20:28.985Z","aliases":["GHSA-cq7v-rfgc-5c7v"],"ecosystem":"npm","patched":["@backstage/backend-defaults 0.17.8"],"slug":"CVE-2026-106492","body":"## Overview\n\nBackstage is an open framework for building developer portals. Prior to 0.16.1 and 0.17.8, the @backstage/backend-defaults package is affected by improper preservation of access restrictions during service credential delegation. An 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. This issue is fixed in versions 0.16.1 and 0.17.8.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Developer Hub, Self-service automation portal 2 · no fix planned: Red Hat Developer Hub, Self-service automation portal 2 · updated 2026-10-07 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106492.json)\n\n## Package advisory (CVE-2026-106492)\n\nAffected packages:\n\n- `@backstage/backend-defaults < 0.17.8`\n\nPatched in:\n\n- `@backstage/backend-defaults 0.17.8`\n\nSource: https://github.com/advisories/GHSA-cq7v-rfgc-5c7v","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":41.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}