CVE-2026-106500

Summary

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.

Affected Software

VendorProductVersion RangeStatus
backstagebackstage< 1.49.6affected
backstagebackstage>= 1.50.0-next.0, < 1.50.5affected
backstagebackstage>= 1.51.0-next.0, < 1.54.6affected
@backstageplugin-scaffolder-backend< 3.3.1affected
@backstageplugin-scaffolder-backend>= 3.4.0, < 3.4.1affected
@backstageplugin-scaffolder-backend>= 4.0.0, < 4.0.3affected
@backstageplugin-scaffolder-backend>= 4.0.4, < 4.1.0affected

Weaknesses

  • CWE-59: CWE-59: Improper Link Resolution Before File Access ('Link Following')
  • CWE-362: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

References