{"id":"CVE-2026-106557","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-106557","generatedAt":"2026-10-27T22:47:43.509Z","title":"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.","description":"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.","published":"2026-10-07T17:16:51.000Z","lastModified":"2026-10-08T21:33:42.000Z","status":"Awaiting Analysis","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":7.7,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N"},"cwe":["CWE-22","CWE-918"],"affected":[],"epss":{"score":0.00297,"percentile":0.22226,"date":"2026-10-26","history":[{"date":"2026-10-08","score":0.00297,"percentile":0.2056}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.30%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-07T17:16:51.000Z","detail":{"score":"7.7","severity":"HIGH","publishedAt":"2026-10-07T17:16:50.900Z"},"summary":"New CVE, high severity (CVSS 7.7)."}],"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"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-106557","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}