Backstage: Bypass of MkDocs configuration sanitizer in TechDocs backend

[ Description ]Official description

Backstage is an open framework for building developer portals. Prior to 1.14.6 and 1.15.4, the @backstage/plugin-techdocs-node package is affected by bypass of mkdocs configuration sanitizer in techdocs backend. Users with the ability to commit changes to a repository that uses TechDocs can circumvent the MkDocs configuration file sanitizer introduced in response to CVE-2026-25153 and execute arbitrary code on the TechDocs backend host during documentation generation. This issue is fixed in versions 1.14.6 and 1.15.4.

[ Fixes ]Fixes and patches

• @backstage/plugin-techdocs-node 1.15.4Fixed version · GitHub Advisories · npm package @backstage/plugin-techdocs-node: upgrade to 1.15.4 or later (affected < 1.15.4)
• Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
• Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
• Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
• Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD

[ Packages ]Affected open-source packages

• @backstage/plugin-techdocs-node npmAffected < 1.15.4 · fixed in 1.15.4 · GHSA-p75x-jh7p-ppcx

[ References ]References

• github.com/backstage/backstage/commit/a7d995f11a5d27f0efbdbe8bb6c21b06988c79c9Patch
• github.com/backstage/backstage/commit/ef92d3d2b76046205c580e7152956514c15640dbPatch
• github.com/backstage/backstage/releases/tag/v1.50.5PatchRelease Notes
• github.com/backstage/backstage/releases/tag/v1.54.6PatchRelease Notes
• github.com/backstage/backstage/security/advisories/GHSA-p75x-jh7p-ppcxMitigationVendor Advisory