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.
Published: 2026-10-07
Score: 5.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-r9ph-3637-55px Backstage: Improper entity validation in deprecated Kubernetes services endpoint
History

Sun, 11 Oct 2026 12:45:00 +0000

Type Values Removed Values Added
First Time appeared Backstage
Backstage backstage
Backstage plugin-kubernetes-backend
Vendors & Products Backstage
Backstage backstage
Backstage plugin-kubernetes-backend

Sat, 10 Oct 2026 03:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Wed, 07 Oct 2026 15:00:00 +0000

Type Values Removed Values Added
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.
Title Backstage: Improper entity validation in deprecated Kubernetes services endpoint
Weaknesses CWE-20
CWE-862
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N'}


Subscriptions

Backstage Backstage Plugin-kubernetes-backend
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-10-10T02:28:55.359Z

Reserved: 2026-10-06T20:31:59.017Z

Link: CVE-2026-106563

cve-icon Vulnrichment

Updated: 2026-10-10T02:28:51.454Z

cve-icon NVD

Status : Undergoing Analysis

Published: 2026-10-07T15:17:17.860

Modified: 2026-10-10T03:17:04.603

Link: CVE-2026-106563

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-11T12:27:56Z

Weaknesses