All vulnerabilities
CVE-2026-106509GHSA-8w7q-29mw-gf5c

@backstage/plugin-techdocs-node: Backstage: Improper validation of MkDocs theme configuration in TechDocs

backstage @backstage/plugin-techdocs-nodenpmLibraries & packages
Open in ThreatlineRecord JSON
CVSS
7.7High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.37%Chance of exploitation activity in the next 30 days, higher than 29% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in1.15.4Fixed versionGitHub
Published6 Oct 2026Updated 7 Oct 2026CVE List

What fixes it

  • 1.15.4@backstage/plugin-techdocs-node, npmGitHubnpm install @backstage/plugin-techdocs-node@1.15.4

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

Impact

When TechDocs is configured to build documentation locally or in a container, a user with write access to a registered repository can include configuration values in mkdocs.yml that cause arbitrary code execution during the documentation build process.

Patches

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

Workarounds

  • Configure TechDocs with techdocs.generator.runIn: 'docker' instead of 'local' to provide container isolation, though this does not fully mitigate the risk.
  • Restrict write access to repositories registered in the Backstage catalog to trusted users.

Text from GitHub Advisory Database

Affected versions 6

  • @backstage/plugin-techdocs-node, npm< 1.15.4GitHub
  • backstageaffected: < 1.50.5CVE List
  • backstageaffected: >= 1.51.0-next.0, < 1.54.6CVE List
  • plugin-techdocs-nodeaffected: < 1.14.6CVE List
  • plugin-techdocs-nodeaffected: >= 1.15.0, < 1.15.4CVE List
  • @backstage/plugin-techdocs-node, npmfrom first release, fixed in 1.15.4OSV

References 7