{"cve":"CVE-2026-106492","nvd":{"published":"2026-10-06T21:17:18.220","modified":"2026-10-22T13:40:44.623","status":"Analyzed","description":"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 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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","score":6.5},"cwes":["CWE-269","CWE-863"],"references":["https://github.com/backstage/backstage/commit/40346245c53e1bf26dee56601e95c5c4ab9cc124","https://github.com/backstage/backstage/commit/bc80ffdafbc92ff7b8c72347eace13cb8688fd33","https://github.com/backstage/backstage/releases/tag/v1.49.6","https://github.com/backstage/backstage/releases/tag/v1.54.6","https://github.com/backstage/backstage/security/advisories/GHSA-cq7v-rfgc-5c7v"],"products":["linuxfoundation:backstage","linuxfoundation:backstage\\/backend-defaults"],"source":"nvd","synced_at":"2026-10-22T16:41:11.231219466+00:00"},"epss":{"cve":"CVE-2026-106492","score":0.00208,"percentile":0.10791,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-cq7v-rfgc-5c7v","url":"https://osv.dev/vulnerability/GHSA-cq7v-rfgc-5c7v","summary":"Backstage: Improper preservation of access restrictions during service credential delegation","modified":"2026-10-07T18:15:11.766063944Z","packages":[{"ecosystem":"npm","name":"@backstage/backend-defaults","purl":"pkg:npm/%40backstage/backend-defaults","ranges":["<0.17.8"],"fixed":["0.17.8"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}