Improper Input Validation in Backstage Plugin by Spotify
CVE-2026-106459

8.5HIGH

Key Information:

Vendor

Backstage

Status
Backstage
Plugin-scaffolder-backend-module-sentry
Vendor
CVE Published:
6 October 2026

What is CVE-2026-106459?

The @backstage/plugin-scaffolder-backend-module-sentry package within Backstage, an open framework for developer portals, experiences an issue with improper input validation across versions 0.3.0 to 0.3.8. This vulnerability allows authenticated internal users to execute specific actions that could lead to the backend contacting unintended external destinations, potentially exposing Sentry integration credentials. The risk posed by this issue is contingent on the network reachability and the permissions associated with the configured token. This vulnerability is resolved in version 0.3.8.

Affected Version(s)

backstage >= 1.47.0, < 1.54.8

plugin-scaffolder-backend-module-sentry >= 0.3.0, < 0.3.8

References

https://github.com/backstage/backstage/security/advisorie...
x_refsource_CONFIRM
https://github.com/backstage/backstage/commit/b0170fad796...
x_refsource_MISC
https://github.com/backstage/backstage/releases/tag/v1.54.8
x_refsource_MISC

CVSS V3.1

Score:
8.5
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.