{"id":"CVE-2026-106509","title":"Backstage is an open framework for building developer portals","summary":"Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by improper validation of mkdocs theme configuration in techdocs. When TechDocs is configured to buil…","severity":"high","cvss":7.7,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L","cwe":["CWE-94","CWE-1336"],"vendor":"backstage","product":"backstage","affected":["backstage < 1.50.5","backstage >= 1.51.0-next.0, < 1.54.6","plugin-techdocs-node < 1.14.6","plugin-techdocs-node >= 1.15.0, < 1.15.4"],"published":"2026-10-06","updated":"2026-10-06","sourceUpdated":"2026-10-06T22:17:06.463","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-106509","references":[{"url":"https://github.com/backstage/backstage/commit/02cd7cdbb18b687446277b5602adaee7f1d53cbb","label":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/commit/a900a9953c8f7ad3ba1906d1d257725a9996cc9d","label":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/releases/tag/v1.50.5","label":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/releases/tag/v1.54.6","label":"security-advisories@github.com"},{"url":"https://github.com/backstage/backstage/security/advisories/GHSA-8w7q-29mw-gf5c","label":"security-advisories@github.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-10-06T22:23:15.969Z","slug":"CVE-2026-106509","body":"## Overview\n\nBackstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by improper validation of mkdocs theme configuration in techdocs. When TechDocs is configured to build documentation locally or in a container, a user with write access to a registered repository can include configuration values in mkdocs.yml that cause arbitrary code execution during the documentation build process. This issue is fixed in versions 1.14.6 and 1.15.4.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":42.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}