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CVE PROGRAM SOURCE RECORD8.8 High

CVE-2026-106558

Backstage: Improper validation of TechDocs MkDocs configuration

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Status
Published
Published
Updated
Assigning organization
GitHub_M

Description

Backstage is an open framework for building developer portals. Prior to 1.14.8, 1.15.6, and 2.0.1, the @backstage/plugin-techdocs-node package improperly validated mapping-style markdown_extensions configuration. An authenticated attacker who can register or influence an SCM-backed documentation source may bypass TechDocs sanitization and cause Python objects to be imported and instantiated in the generator runtime, leading to arbitrary code execution. Earlier fixes in versions 1.14.6 and 1.15.4 did not fully address the supported mapping representation of markdown_extensions. Impact is greatest when documentation generation runs with backend credentials, filesystem access, or internal network access. This issue is fixed in versions 1.14.8, 1.15.6, and 2.0.1.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

backstage backstage

  • < 1.50.7affected
  • >= 1.51.0-next.0, < 1.54.9affected
  • >= 1.55.0-next.0, < 1.55.2affected

@backstage plugin-techdocs-node

  • < 1.14.8affected
  • >= 1.15.0, < 1.15.6affected
  • >= 2.0.0, < 2.0.1affected

References