{"id":"GHSA-f7v3-xhm6-w245","summary":"Backstage has improper input validation in TechDocs Markdown extension configuration","details":"### Impact\n\nAn authenticated user who can register or modify documentation sources may cause a TechDocs build to access resources outside the intended documentation boundary. Depending on deployment configuration, this may expose sensitive backend-host data or internal network resources.\n\n### Patches\n\nPatched in `@backstage/plugin-techdocs-node` version `1.15.4`.\n\nAdopters must also use `pymdown-extensions` version `10.21.3` or newer, normally through `mkdocs-techdocs-core` version `1.7.0` or newer. `@backstage/plugin-techdocs-node` does not control the Python dependencies used by the generator; with an older PyMdown release, snippets may remain vulnerable to file inclusion even after their configuration is sanitized.\n\n### Workarounds\n\n- Generate TechDocs only from trusted repositories with reviewed MkDocs configuration.\n- Use isolated build environments with restricted filesystem access and network egress.\n- Prefer externally generated TechDocs with appropriately sandboxed CI.","aliases":["CVE-2026-106557"],"modified":"2026-10-07T16:30:06.348764958Z","published":"2026-10-07T16:22:58Z","database_specific":{"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-10-07T16:22:58Z","nvd_published_at":null,"cwe_ids":["CWE-22","CWE-918"]},"references":[{"type":"WEB","url":"https://github.com/backstage/backstage/security/advisories/GHSA-f7v3-xhm6-w245"},{"type":"WEB","url":"https://github.com/backstage/backstage/commit/017ace52d9b327ededc6704cf17799c875ae0f29"},{"type":"WEB","url":"https://github.com/backstage/backstage/commit/2d9de4ca117a529de4b6ed7dfb7aa507ca7b3f91"},{"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-f7v3-xhm6-w245/GHSA-f7v3-xhm6-w245.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N"}]}