Backstage: Sensitive information exposure in Scaffolder

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-106501
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 sensitive information exposure in scaffolder. An authenticated Backstage user who can read another user's Scaffolder task may receive internal execution data. In deployments where that data contains credentials for an external service, this may permit disclosure and unauthorized changes in that external service. 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 9.6 CRITICAL from [email protected]

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

Problem Types: CWE-200 | CWE-201 | CWE-200 CWE-200: Exposure of Sensitive Information to an Unauthorized Actor | CWE-201 CWE-201: Insertion of Sensitive Information Into Sent Data

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
3.1CNADECLARED9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

CVSS v3.1 Breakdown

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

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

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/commit/66d2219edf0abe33ab7d0c1ced5d069d1e... [email protected] github.com
github.com/backstage/backstage/commit/e262d649981ff99bb01ca7077807ae3e25... [email protected] github.com
github.com/backstage/backstage/releases/tag/v1.50.5 [email protected] github.com
github.com/backstage/backstage/commit/c19838870476a8e29144c84b1a5ac0654e... [email protected] github.com
github.com/backstage/backstage/releases/tag/v1.49.6 [email protected] github.com
github.com/backstage/backstage/releases/tag/v1.54.6 [email protected] github.com
github.com/backstage/backstage/security/advisories/GHSA-g2v8-7jhw-pp8p [email protected] github.com
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