{"id":"CVE-2026-106492","sourceIdentifier":"security-advisories@github.com","published":"2026-10-06T21:17:18.220","lastModified":"2026-10-22T13:40:44.623","vulnStatus":"Analyzed","cveTags":[],"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":[{"source":"security-advisories@github.com","affectedData":[{"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"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L","baseScore":7.6,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"HIGH","availabilityImpact":"LOW"},"exploitabilityScore":2.8,"impactScore":4.7},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","baseScore":6.5,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":2.8,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-10-09T01:50:58.091263Z","id":"CVE-2026-106492","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-269"},{"lang":"en","value":"CWE-863"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:linuxfoundation:backstage\\/backend-defaults:*:*:*:*:*:node.js:*:*","versionEndExcluding":"0.16.1","matchCriteriaId":"FE0DEC62-AC08-4DBC-B86A-D456E4A68702"},{"vulnerable":true,"criteria":"cpe:2.3:a:linuxfoundation:backstage\\/backend-defaults:*:*:*:*:*:node.js:*:*","versionStartIncluding":"0.17.0","versionEndExcluding":"0.17.8","matchCriteriaId":"A304D66B-E00E-4B3E-9673-5555FA6F56A5"}]}]},{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*","versionEndExcluding":"1.49.6","matchCriteriaId":"8D095FA7-D58D-4B37-84B2-0E565FF215C1"},{"vulnerable":true,"criteria":"cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*","versionStartIncluding":"1.50.0","versionEndExcluding":"1.54.6","matchCriteriaId":"78EE3EAD-3765-4873-8C71-7A3F3AAA900F"}]}]}],"references":[{"url":"https://github.com/backstage/backstage/commit/40346245c53e1bf26dee56601e95c5c4ab9cc124","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/backstage/backstage/commit/bc80ffdafbc92ff7b8c72347eace13cb8688fd33","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.49.6","source":"security-advisories@github.com","tags":["Patch","Release Notes"]},{"url":"https://github.com/backstage/backstage/releases/tag/v1.54.6","source":"security-advisories@github.com","tags":["Patch","Release Notes"]},{"url":"https://github.com/backstage/backstage/security/advisories/GHSA-cq7v-rfgc-5c7v","source":"security-advisories@github.com","tags":["Mitigation","Vendor Advisory"]}]}