CVE-2026-88064Backstage: Improper input validation in TechDocs MkDocs configuration

Descripción

Backstage is an open framework for building developer portals. Prior to 1.14.6 and from 1.15.0 until 1.15.4, the @backstage/plugin-techdocs-node package insufficiently validates mkdocs.yml supplied by an authenticated user who can register or modify a TechDocs source. Unsafe Python YAML tags, markdown_extensions names and configuration, theme options, and extra_templates values can reach the documentation generator and cause unintended code execution. The resulting impact is limited to the files, credentials, network access, and other resources available to the TechDocs backend or build container. This issue is fixed in versions 1.14.6 and 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-292q-8mf5-h6g3 MitigationVendor Advisory
• https://github.com/backstage/backstage/commit/017ace52d9b327ededc6704cf17799c875ae0f29 Patch
• https://github.com/backstage/backstage/commit/02cd7cdbb18b687446277b5602adaee7f1d53cbb Patch
• https://github.com/backstage/backstage/commit/25125ee727a3de3418a8fa6a9e458cd5b73ecf26 Patch
• https://github.com/backstage/backstage/commit/a7d995f11a5d27f0efbdbe8bb6c21b06988c79c9 Patch
• https://github.com/backstage/backstage/commit/a900a9953c8f7ad3ba1906d1d257725a9996cc9d Patch
• https://github.com/backstage/backstage/releases/tag/v1.50.5 PatchRelease Notes
• https://github.com/backstage/backstage/releases/tag/v1.54.6 PatchRelease Notes