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CVE-2026-106558

CVE-2026-106558 · Backstage: Improper validation of TechDocs MkDocs configuration

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 8.8 · High · EPSS 0.5% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • backstage

    Versions
    • < 1.50.7: Affected
    • >= 1.51.0-next.0, < 1.54.9: Affected
    • >= 1.55.0-next.0, < 1.55.2: Affected

    No fix published

  • plugin-techdocs-node

    Versions
    • < 1.14.8: Affected
    • >= 1.15.0, < 1.15.6: Affected
    • >= 2.0.0, < 2.0.1: Affected

    No fix published

  • @backstage/plugin-techdocs-node npm

    Affected ranges
    • SEMVER: < 1.15.4

    Update to 1.15.4

Original sources

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