CVE-2026-106459

Backstage: Improper input validation in Sentry scaffolder actions

State: Published
Severity: 8.5 High
Published: Oct 6, 2026
Updated: Oct 7, 2026
Reserved: Oct 6, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.5 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N	GitHub_M

Weaknesses

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Product	Versions
backstagebackstage	>= 1.47.0, < 1.54.8Affected
plugin-scaffolder-backend-module-sentry@backstage	>= 0.3.0, < 0.3.8Affected

References

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