{"id":"CVE-2026-106492","state":"PUBLISHED","title":"Backstage: Improper preservation of access restrictions during service credential delegation","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.","publishedAt":"2026-10-06T20:48:05.896Z","updatedAt":"2026-10-09T01:51:07.252Z","severity":{"score":7.6,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["backstage backstage","@backstage backend-defaults"],"affected":[{"vendor":"backstage","product":"backstage","versions":[{"version":"< 1.49.6","status":"affected"},{"version":">= 1.50.0-next.0, < 1.54.6","status":"affected"}]},{"vendor":"@backstage","product":"backend-defaults","versions":[{"version":"< 0.16.1","status":"affected"},{"version":">= 0.17.0, < 0.17.8","status":"affected"}]}],"references":["https://github.com/backstage/backstage/security/advisories/GHSA-cq7v-rfgc-5c7v","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"],"weaknesses":["CWE-269","CWE-863"],"ingestedAt":"2026-10-29T20:10:23.711Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/106xxx/CVE-2026-106492.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-106492","state":"PUBLISHED","datePublished":"2026-10-06T20:48:05.896Z","dateUpdated":"2026-10-09T01:51:07.252Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-10-06T18:46:47.766Z"},"containers":{"cna":{"title":"Backstage: Improper preservation of access restrictions during service credential delegation","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"backstage","product":"backstage","versions":[{"version":"< 1.49.6","status":"affected"},{"version":">= 1.50.0-next.0, < 1.54.6","status":"affected"}]},{"vendor":"@backstage","product":"backend-defaults","versions":[{"version":"< 0.16.1","status":"affected"},{"version":">= 0.17.0, < 0.17.8","status":"affected"}]}],"references":[{"url":"https://github.com/backstage/backstage/security/advisories/GHSA-cq7v-rfgc-5c7v","name":"https://github.com/backstage/backstage/security/advisories/GHSA-cq7v-rfgc-5c7v","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/backstage/backstage/commit/40346245c53e1bf26dee56601e95c5c4ab9cc124","name":"https://github.com/backstage/backstage/commit/40346245c53e1bf26dee56601e95c5c4ab9cc124","tags":["x_refsource_MISC"]},{"url":"https://github.com/backstage/backstage/commit/bc80ffdafbc92ff7b8c72347eace13cb8688fd33","name":"https://github.com/backstage/backstage/commit/bc80ffdafbc92ff7b8c72347eace13cb8688fd33","tags":["x_refsource_MISC"]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.49.6","name":"https://github.com/backstage/backstage/releases/tag/v1.49.6","tags":["x_refsource_MISC"]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.54.6","name":"https://github.com/backstage/backstage/releases/tag/v1.54.6","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":7.6,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-269","lang":"en","description":"CWE-269: Improper Privilege Management","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-863","lang":"en","description":"CWE-863: Incorrect Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-06T20:48:05.896Z"},"source":{"advisory":"GHSA-cq7v-rfgc-5c7v","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-09T01:50:58.091263Z","id":"CVE-2026-106492","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-09T01:51:07.252Z"}}]}}}