CVE-2026-106563

Backstage: Improper entity validation in deprecated Kubernetes services endpoint

State: Published
Severity: 5.3 Medium
Published: Oct 7, 2026
Updated: Oct 10, 2026
Reserved: Oct 6, 2026

Description

Backstage is an open framework for building developer portals. Prior to 0.21.8, the @backstage/plugin-kubernetes-backend package is affected by improper entity validation in deprecated kubernetes services endpoint. An authenticated user with Kubernetes read permissions could access Kubernetes workload data beyond their intended scope by supplying crafted entity data to the deprecated services endpoint. The exposure is limited to read-only access to Kubernetes object metadata across configured clusters. This issue is fixed in version 0.21.8.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N	GitHub_M

Weaknesses

CWE-20 Improper Input Validation
CWE-862 Missing Authorization

Affected Products

Product	Versions
backstagebackstage	< 1.54.1Affected
plugin-kubernetes-backend@backstage	< 0.21.8Affected

References

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