CVE-2026-106508Backstage: Potential file exposure through local TechDocs publisher

Descripción

Backstage is an open framework for building developer portals. Prior to 1.15.4, the @backstage/plugin-techdocs-node package is affected by potential file exposure through local techdocs publisher. When 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. This 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. This issue is fixed in version 1.15.4.

Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.

Productos y versiones afectados

Referencias y parches

• https://github.com/backstage/backstage/security/advisories/GHSA-cm77-ch27-6w6v MitigationVendor Advisory
• https://github.com/backstage/backstage/commit/6aecb26f337ffec1d4e67ce903cf1e39b6082ec4 Patch
• https://github.com/backstage/backstage/releases/tag/v1.54.6 PatchRelease Notes