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CVE-2026-106557

Backstage: Improper input validation in TechDocs Markdown extension configuration PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
backstage / backstageaffected < 1.50.5; affected >= 1.51.0-next.0, < 1.54.6
@backstage / plugin-techdocs-nodeaffected < 1.14.6; affected >= 1.15.0, < 1.15.4

CWE

CWE-22, CWE-918

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.