Description

Backstage has improper input validation in TechDocs Markdown extension configuration

Impact

An 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.

Patches

Patched in @backstage/plugin-techdocs-node version 1.15.4.

Adopters 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.

Workarounds

Generate TechDocs only from trusted repositories with reviewed MkDocs configuration.

Use isolated build environments with restricted filesystem access and network egress.

Prefer externally generated TechDocs with appropriately sandboxed CI.

Mitigation

Aliases

References