{"id":"CVE-2026-106557","sourceIdentifier":"security-advisories@github.com","published":"2026-10-07T17:16:50.900","lastModified":"2026-10-08T21:33:42.423","vulnStatus":"Awaiting Analysis","cveTags":[],"descriptions":[{"lang":"en","value":"Backstage is an open framework for building developer portals. Prior to 1.14.6 and 1.15.4, the @backstage/plugin-techdocs-node package did not sufficiently validate TechDocs Markdown extension configuration. An authenticated user who can register or modify documentation sources may cause a TechDocs build to access resources outside the intended documentation boundary, potentially exposing backend-host data or internal network resources. This issue is fixed in versions 1.14.6 and 1.15.4 when pymdown-extensions 10.21.3 or later is also used, normally through mkdocs-techdocs-core 1.7.0 or later."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"backstage","product":"backstage","versions":[{"version":"< 1.50.5","status":"affected"},{"version":">= 1.51.0-next.0, < 1.54.6","status":"affected"}]},{"vendor":"@backstage","product":"plugin-techdocs-node","versions":[{"version":"< 1.14.6","status":"affected"},{"version":">= 1.15.0, < 1.15.4","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:C/C:H/I:N/A:N","baseScore":7.7,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":3.1,"impactScore":4.0}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-10-07T17:47:07.050445Z","id":"CVE-2026-106557","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-22"},{"lang":"en","value":"CWE-918"}]}],"references":[{"url":"https://github.com/backstage/backstage/commit/017ace52d9b327ededc6704cf17799c875ae0f29","source":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/commit/2d9de4ca117a529de4b6ed7dfb7aa507ca7b3f91","source":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/releases/tag/v1.50.5","source":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/releases/tag/v1.54.6","source":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/security/advisories/GHSA-f7v3-xhm6-w245","source":"security-advisories@github.com"}]}