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  5. CVE-2026-106500

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

October 7, 2026

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.

References

  • github.com/advisories/GHSA-xvgh-hmx8-9xxf
  • github.com/backstage/backstage/commit/0d24f1b8701f3dde6cd597f81997c1ea873a43ae
  • github.com/backstage/backstage/commit/56be299dd3ef6706e13e76ea2f8a9b0dd0b6413d
  • github.com/backstage/backstage/commit/9e86c95a1a3ddfd54db03731cd8678aa63495175
  • github.com/backstage/backstage/releases/tag/v1.49.6
  • github.com/backstage/backstage/releases/tag/v1.50.5
  • github.com/backstage/backstage/releases/tag/v1.54.6
  • github.com/backstage/backstage/security/advisories/GHSA-xvgh-hmx8-9xxf
  • nvd.nist.gov/vuln/detail/CVE-2026-106500

Code Behaviors & Features

Detect and mitigate CVE-2026-106500 with GitLab Dependency Scanning

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Affected versions

All versions before 4.1.0

Fixed versions

  • 4.1.0

Solution

Upgrade to version 4.1.0 or above.

Impact 8.5 HIGH

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Learn more about CVSS

Weakness

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

Source file

npm/@backstage/plugin-scaffolder-backend/CVE-2026-106500.yml

Spotted a mistake? Edit the file on GitLab.

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