{"id":"GHSA-4488-j8vj-vqqv","summary":"Backstage: Remote code execution via crafted markdown_extensions in TechDocs mkdocs.yml","details":"### Impact\n\nAn authenticated user who can register catalog entities can provide a crafted `mkdocs.yml` causing arbitrary OS command execution on the TechDocs build host when the docs are built.\n\n### Patches\n\nPatched in `@backstage/plugin-techdocs-node`, version `1.15.4`.\n\n### Workarounds\n\nIf you cannot upgrade immediately:\n\n- Switch to `techdocs.builder: external` to isolate TechDocs builds in a container.\n- Restrict who can register catalog entities with TechDocs annotations.\n- Audit existing catalog entities for suspicious `markdown_extensions` values in their `mkdocs.yml` files.","aliases":["CVE-2026-106510"],"modified":"2026-10-07T18:15:10.717894363Z","published":"2026-10-07T18:03:22Z","database_specific":{"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-10-07T18:03:22Z","nvd_published_at":"2026-10-07T15:17:12Z","cwe_ids":["CWE-183","CWE-470"]},"references":[{"type":"WEB","url":"https://github.com/backstage/backstage/security/advisories/GHSA-4488-j8vj-vqqv"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-106510"},{"type":"WEB","url":"https://github.com/backstage/backstage/commit/02cd7cdbb18b687446277b5602adaee7f1d53cbb"},{"type":"WEB","url":"https://github.com/backstage/backstage/commit/a900a9953c8f7ad3ba1906d1d257725a9996cc9d"},{"type":"PACKAGE","url":"https://github.com/backstage/backstage"},{"type":"WEB","url":"https://github.com/backstage/backstage/releases/tag/v1.50.5"},{"type":"WEB","url":"https://github.com/backstage/backstage/releases/tag/v1.54.6"}],"affected":[{"package":{"name":"@backstage/plugin-techdocs-node","ecosystem":"npm","purl":"pkg:npm/%40backstage/plugin-techdocs-node"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.15.4"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-4488-j8vj-vqqv/GHSA-4488-j8vj-vqqv.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L"}]}