{"id":"GHSA-8w7q-29mw-gf5c","revision":"a676bc8b079f4f92af508ea2517ec280","records":[{"revision":"a676bc8b079f4f92af508ea2517ec280","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-8w7q-29mw-gf5c","aliases":["CVE-2026-106509"],"title":"Backstage: Improper validation of MkDocs theme configuration in TechDocs","description":"### Impact\n\nWhen 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.\n\n### Patches\n\nPatched in `@backstage/plugin-techdocs-node` version `1.15.4`\n\n### Workarounds\n\n- Configure TechDocs with `techdocs.generator.runIn: 'docker'` instead of `'local'` to provide container isolation, though this does not fully mitigate the risk.\n- Restrict write access to repositories registered in the Backstage catalog to trusted users.","state":0,"publishedAt":"2026-10-07T16:23:30+00:00","modifiedAt":"2026-10-07T16:30:04.7181065+00:00","affected":[{"ecosystem":"npm","name":"@backstage/plugin-techdocs-node","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.15.4"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/backstage/backstage/security/advisories/GHSA-8w7q-29mw-gf5c","https://nvd.nist.gov/vuln/detail/CVE-2026-106509","https://github.com/backstage/backstage/commit/02cd7cdbb18b687446277b5602adaee7f1d53cbb","https://github.com/backstage/backstage/commit/a900a9953c8f7ad3ba1906d1d257725a9996cc9d","https://github.com/backstage/backstage","https://github.com/backstage/backstage/releases/tag/v1.50.5","https://github.com/backstage/backstage/releases/tag/v1.54.6"],"sourceUrl":"https://github.com/advisories/GHSA-8w7q-29mw-gf5c","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-8w7q-29mw-gf5c","identifiers":["GHSA-8w7q-29mw-gf5c","CVE-2026-106509"]},"retained":false,"historicalAffected":[]}],"coverage":[]}