{"id":"CVE-2026-106492","summary":"Backstage: Improper preservation of access restrictions during service credential delegation","details":"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.","aliases":["GHSA-cq7v-rfgc-5c7v"],"modified":"2026-10-08T02:49:31.557560602Z","published":"2026-10-06T20:48:05.896Z","database_specific":{"cwe_ids":["CWE-269","CWE-863"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106492.json","unresolved_ranges":[{"extracted_events":[{"introduced":"0.17.0"},{"fixed":"0.17.8"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"GitHub_M"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/backstage/backstage","events":[{"introduced":"0"},{"introduced":"f29d18c2fd55f0448f0fbaf8525178676dccd52d"},{"fixed":"e8c20440640d1d2baffbf6e44a71e6960e5eb2ec"},{"fixed":"278b50f5dfce326beba891c7aafc12cf1e65c5c0"},{"fixed":"0e67bc1fc88fba3a8cb716d3584cef05ecbcf9a8"},{"fixed":"40346245c53e1bf26dee56601e95c5c4ab9cc124"},{"fixed":"bc80ffdafbc92ff7b8c72347eace13cb8688fd33"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.49.6"},{"fixed":"0.16.1"},{"introduced":"1.50.0-next.0"},{"fixed":"1.54.6"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v1.54.5","v1.54.4","v1.54.3","v1.54.2","v1.54.1","v1.54.0","v1.54.0-next.3","v1.54.0-next.2","v1.53.0","v1.54.0-next.1","v1.54.0-next.0","v1.53.0-next.2","v1.53.0-next.1","v1.52.0","v1.53.0-next.0","v1.52.0-next.2","v1.52.0-next.1","v1.51.0","v1.52.0-next.0","v1.51.0-next.3","v1.51.0-next.2","v1.51.0-next.1","v1.51.0-next.0","v1.50.0","v1.50.0-next.2","v1.50.0-next.1","v1.50.0-next.0","v0.16.0","release-2021-03-04","v0.15.0","release-2021-02-23","v0.14.0","release-2021-02-18","v0.13.1","release-2021-02-16","v0.13.0","release-2021-02-11","v0.12.0","release-2021-02-05","v0.11.3","release-2021-02-03","v0.11.2","release-2021-02-01","v0.11.1","release-2021-01-29","v0.11.0","release-2021-01-28","v0.10.0","release-2021-01-21.1","v0.9.0","release-2021-01-21","v0.8.2","release-2021-01-20","v0.8.1","release-2021-01-18","v0.8.0","release-2021-01-14.1","v0.7.0","release-2021-01-14","v0.6.0","release-2021-01-09","v0.5.0","release-2021-01-08","release-2021-1-7","release-2021-01-07","v0.4.3","v0.4.2","v0.4.1","v0.4.0","v0.3.2","v0.3.1","v0.3.0","v0.2.0","v0.1.1","v0.1.1-alpha.26","v0.1.1-alpha.25","v0.1.1-alpha.24","v0.1.1-alpha.23","v0.1.1-alpha.22","v0.1.1-alpha.21","v0.1.1-alpha.20","v0.1.1-alpha.19","v0.1.1-alpha.18","v0.1.1-alpha.17","v0.1.1-alpha.16","v0.1.1-alpha.15","v0.1.1-alpha.13","v0.1.1-alpha.12","v0.1.1-alpha.11","v0.1.1-alpha.10","cli-old-cache-watch","v0.1.1-alpha.8","v0.1.1-alpha.7","v0.1.1-alpha.6","v0.1.1-alpha.5","v0.1.1-alpha.4","v0.1.1-alpha.3","v0.1.1-alpha.2","v0.1.1-alpha.1","v0.1.1-alpha.0","v0.1.0","hackweek-demo"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-106492.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"}]}