{"id":"GHSA-cm77-ch27-6w6v","summary":"Backstage has potential file exposure through local TechDocs publisher","details":"### Impact\n\nWhen using the local TechDocs publisher (`techdocs.publisher.type: 'local'`), it was possible for the documentation serving endpoint to follow filesystem references outside the intended documentation tree, potentially exposing host files to authenticated users.\n\nThis is mitigated by the fact that exploration requires preconditions that do not arise through normal MkDocs operation. Cloud-based publishers (S3, GCS, Azure Blob Storage) are not affected.\n\n### Patches\n\nPatched in `@backstage/plugin-techdocs-node` version `1.15.4`\n\n### Workarounds\n\nIf you cannot upgrade immediately, consider switching to an external store for published TechDocs content (e.g. `awsS3`, `googleGcs`, or `azureBlobStorage` publishers)","aliases":["CVE-2026-106508"],"modified":"2026-10-07T16:30:06.353170553Z","published":"2026-10-07T16:23:46Z","database_specific":{"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-10-07T16:23:46Z","nvd_published_at":"2026-10-06T22:17:06Z","cwe_ids":["CWE-22","CWE-59"]},"references":[{"type":"WEB","url":"https://github.com/backstage/backstage/security/advisories/GHSA-cm77-ch27-6w6v"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-106508"},{"type":"WEB","url":"https://github.com/backstage/backstage/commit/6aecb26f337ffec1d4e67ce903cf1e39b6082ec4"},{"type":"PACKAGE","url":"https://github.com/backstage/backstage"},{"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-cm77-ch27-6w6v/GHSA-cm77-ch27-6w6v.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"}]}