Backstage: Improper task state validation in Scaffolder backend

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-106500
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 22:17:05 UTC
Updated2026-10-06 22:17:05 UTC
DescriptionBackstage 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.

Risk And Classification

Primary CVSS: v3.1 8.5 HIGH from [email protected]

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

Problem Types: CWE-59 | CWE-362 | 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')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.5HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED8.5HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Backstage Backstage affected < 1.49.6 Not specified
CNA Backstage Backstage affected >= 1.50.0-next.0, < 1.50.5 Not specified
CNA Backstage Backstage affected >= 1.51.0-next.0, < 1.54.6 Not specified
CNA @backstage Plugin-scaffolder-backend affected < 3.3.1 Not specified
CNA @backstage Plugin-scaffolder-backend affected >= 3.4.0, < 3.4.1 Not specified
CNA @backstage Plugin-scaffolder-backend affected >= 4.0.0, < 4.0.3 Not specified
CNA @backstage Plugin-scaffolder-backend affected >= 4.0.4, < 4.1.0 Not specified

References

ReferenceSourceLinkTags
github.com/backstage/backstage/security/advisories/GHSA-xvgh-hmx8-9xxf [email protected] github.com
github.com/backstage/backstage/releases/tag/v1.50.5 [email protected] github.com
github.com/backstage/backstage/commit/0d24f1b8701f3dde6cd597f81997c1ea87... [email protected] github.com
github.com/backstage/backstage/commit/9e86c95a1a3ddfd54db03731cd8678aa63... [email protected] github.com
github.com/backstage/backstage/releases/tag/v1.49.6 [email protected] github.com
github.com/backstage/backstage/commit/56be299dd3ef6706e13e76ea2f8a9b0dd0... [email protected] github.com
github.com/backstage/backstage/releases/tag/v1.54.6 [email protected] github.com
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