CVE-2026-106510 PUBLISHED

Backstage: Remote code execution via crafted markdown_extensions in TechDocs mkdocs.yml

Assigner: GitHub_M
Reserved: 06.10.2026 Published: 07.10.2026 Updated: 07.10.2026

Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by remote code execution via crafted markdown_extensions in techdocs mkdocs.yml. An authenticated user who can register catalog entities can provide a crafted mkdocs.yml causing arbitrary OS command execution on the TechDocs build host when the docs are built. This issue is fixed in versions 1.14.6 and 1.15.4.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L
CVSS Score: 7.7

Product Status

Vendor backstage
Product backstage
Versions
  • Version < 1.50.5 is affected
  • Version >= 1.51.0-next.0, < 1.54.6 is affected
Vendor @backstage
Product plugin-techdocs-node
Versions
  • Version < 1.14.6 is affected
  • Version >= 1.15.0, < 1.15.4 is affected

References

Problem Types

  • CWE-183: Permissive List of Allowed Inputs CWE
  • CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') CWE