{"id":"GHSA-f7v3-xhm6-w245","revision":"d7b21c739b93434cad629ddddf854a71","records":[{"revision":"d7b21c739b93434cad629ddddf854a71","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-f7v3-xhm6-w245","aliases":["CVE-2026-106557"],"title":"Backstage has improper input validation in TechDocs Markdown extension configuration","description":"### 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.","state":0,"publishedAt":"2026-10-07T16:22:58+00:00","modifiedAt":"2026-10-07T16:30:06.348765+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:L/PR:L/UI:N/S:C/C:H/I:N/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/backstage/backstage/security/advisories/GHSA-f7v3-xhm6-w245","https://github.com/backstage/backstage/commit/017ace52d9b327ededc6704cf17799c875ae0f29","https://github.com/backstage/backstage/commit/2d9de4ca117a529de4b6ed7dfb7aa507ca7b3f91","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-f7v3-xhm6-w245","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-f7v3-xhm6-w245","identifiers":["GHSA-f7v3-xhm6-w245","CVE-2026-106557"]},"retained":false,"historicalAffected":[]}],"coverage":[]}