CVE-2026-106459

Backstage: Improper input validation in Sentry scaffolder actions

Published Oct 6, 2026 CVSS 3.1 · 8.5 High EPSS < 1% KEV · Not listed
Description
Backstage is an open framework for building developer portals. From 0.3.0 until 0.3.8, the @backstage/plugin-scaffolder-backend-module-sentry package is affected by improper input validation in sentry scaffolder actions. An authenticated internal user who can execute the affected actions may cause the backend to contact unintended destinations and disclose Sentry integration credentials. Subsequent impact depends on network reachability and the privileges granted to the configured token. This issue is fixed in version 0.3.8.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-g734-fhp4-7mfp Backstage: Improper input validation in Sentry scaffolder actions
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Linuxfoundation
Linuxfoundation backstage
Linuxfoundation backstage\/plugin-scaffolder-backend-module-sentry
CPEs cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend-module-sentry:*:*:*:*:*:node.js:*:*
Vendors & Products Linuxfoundation
Linuxfoundation backstage
Linuxfoundation backstage\/plugin-scaffolder-backend-module-sentry
Type Values Removed Values Added
First Time appeared Backstage
Backstage backstage
Backstage plugin-scaffolder-backend-module-sentry
Vendors & Products Backstage
Backstage backstage
Backstage plugin-scaffolder-backend-module-sentry
Type Values Removed Values Added
Description Backstage is an open framework for building developer portals. From 0.3.0 until 0.3.8, the @backstage/plugin-scaffolder-backend-module-sentry package is affected by improper input validation in sentry scaffolder actions. An authenticated internal user who can execute the affected actions may cause the backend to contact unintended destinations and disclose Sentry integration credentials. Subsequent impact depends on network reachability and the privileges granted to the configured token. This issue is fixed in version 0.3.8.
Title Backstage: Improper input validation in Sentry scaffolder actions
Weaknesses CWE-200
CWE-918
References
Metrics cvssV3_1

{'score': 8.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Oct 7, 2026, 4:24 PM
Reserved
Oct 6, 2026, 4:49 PM
Status
Analyzed
Published
Oct 6, 2026, 9:17 PM
Modified
Oct 13, 2026, 3:27 PM