{"schema":"threatline.record/2","record":{"id":"CVE-2026-106557","aliases":["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.","categories":["Libraries & packages"],"product":"@backstage/plugin-techdocs-node","vendor":"backstage","ecosystem":"npm","affected_ranges":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-f7v3-xhm6-w245","source_modified_at":"2026-10-07T16:22:59Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-techdocs-node"},"range":"< 1.15.4"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-106557","source_modified_at":"2026-10-07T17:47:16.631Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"backstage","vendor":"backstage","versions":[{"version":"< 1.50.5","status":"affected"},{"version":">= 1.51.0-next.0, < 1.54.6","status":"affected"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-106557","source_modified_at":"2026-10-07T17:47:16.631Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"plugin-techdocs-node","vendor":"@backstage","versions":[{"version":"< 1.14.6","status":"affected"},{"version":">= 1.15.0, < 1.15.4","status":"affected"}],"defaultStatus":null},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-f7v3-xhm6-w245","source_modified_at":"2026-10-07T16:30:06.348764958Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-techdocs-node","purl":"pkg:npm/%40backstage/plugin-techdocs-node"},"ranges":[{"events":[{"introduced":"0"},{"fixed":"1.15.4"}],"type":"SEMVER"}],"versions":[]}],"fixed_versions":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-f7v3-xhm6-w245","source_modified_at":"2026-10-07T16:22:59Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-techdocs-node"},"version":"1.15.4"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-f7v3-xhm6-w245","source_modified_at":"2026-10-07T16:30:06.348764958Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"@backstage/plugin-techdocs-node","purl":"pkg:npm/%40backstage/plugin-techdocs-node"},"version":"1.15.4"}],"cvss":7.7,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00297,"percentile":0.21291,"score_date":"2026-10-23"},"published_at":"2026-10-07T16:22:53.320Z","modified_at":"2026-10-07T17:47:16.631Z","provenance":[{"source":"GitHub Advisory Database","url":"https://github.com/advisories/GHSA-f7v3-xhm6-w245","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-07T16:22:59Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-106557","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-07T17:47:16.631Z"},{"source":"OSV","url":"https://osv.dev/vulnerability/GHSA-f7v3-xhm6-w245","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-07T16:30:06.348764958Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-106557","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["GitHub Advisory Database","CVE List","OSV","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/backstage/backstage/security/advisories/GHSA-f7v3-xhm6-w245","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/backstage/backstage/commit/017ace52d9b327ededc6704cf17799c875ae0f29","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/backstage/backstage/commit/2d9de4ca117a529de4b6ed7dfb7aa507ca7b3f91","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/backstage/backstage/releases/tag/v1.50.5","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/backstage/backstage/releases/tag/v1.54.6","tags":["x_refsource_MISC"]},{"url":"https://github.com/advisories/GHSA-f7v3-xhm6-w245","source":"GitHub Advisory Database"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"partial","assessed_at":"2026-10-07T17:47:07.050445Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"ecosystem","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-07T17:47:16.631Z","content_hash":"8baf3ca51b027ab63c713c190d2c9e22aad0e09d97121125fd2d01d4ce4bce8e"}}