Backstage has improper input validation in TechDocs Markdown extension configuration

[ 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 did not sufficiently validate TechDocs Markdown extension configuration. An authenticated user who can register or modify documentation sources may cause a TechDocs build to access resources outside the intended documentation boundary, potentially exposing backend-host data or internal network resources. This issue is fixed in versions 1.14.6 and 1.15.4 when pymdown-extensions 10.21.3 or later is also used, normally through mkdocs-techdocs-core 1.7.0 or later.

[ 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)

[ Packages ]Affected open-source packages

• @backstage/plugin-techdocs-node npmAffected < 1.15.4 · fixed in 1.15.4 · GHSA-f7v3-xhm6-w245

[ References ]References

• github.com/backstage/backstage/commit/017ace52d9b327ededc6704cf17799c875ae0f29
• github.com/backstage/backstage/commit/2d9de4ca117a529de4b6ed7dfb7aa507ca7b3f91
• github.com/backstage/backstage/releases/tag/v1.50.5
• github.com/backstage/backstage/releases/tag/v1.54.6
• github.com/backstage/backstage/security/advisories/GHSA-f7v3-xhm6-w245