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CVE-2026-106500

CVE-2026-106500 · Backstage: Improper task state validation in Scaffolder backend

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 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by improper task state validation in scaffolder backend. An authenticated user with permission to create and access Scaffolder tasks may, under specific timing and deployment conditions, affect files accessible to the Backstage backend. If backend application files are writable, the confidentiality, integrity, and availability of the backend may be compromised. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.

CVSS 8.5 · High · EPSS 0.3% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • backstage

    Versions
    • < 1.49.6: Affected
    • >= 1.50.0-next.0, < 1.50.5: Affected
    • >= 1.51.0-next.0, < 1.54.6: Affected

    No fix published

  • plugin-scaffolder-backend

    Versions
    • < 3.3.1: Affected
    • >= 3.4.0, < 3.4.1: Affected
    • >= 4.0.0, < 4.0.3: Affected
    • >= 4.0.4, < 4.1.0: Affected

    No fix published

  • @backstage/plugin-scaffolder-backend npm

    Affected ranges
    • SEMVER: < 4.1.0

    Update to 4.1.0

Original sources

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