Medium 5.3Published Oct 7, 2026

CVE-2026-106563Backstage: Improper entity validation in deprecated Kubernetes services endpoint

Updated under an hour ago (2026-10-19 07:50 UTC)

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It affects backstage and 3 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE): CWE-20, CWE-862
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Oct 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

backstage backstage backstage:backstage (from the name)	before 1.54.1	CNA record
@backstage plugin-kubernetes-backend backstage:plugin_kubernetes_backend (from the name)	before 0.21.8	CNA record
linuxfoundation backstage/plugin-kubernetes-backend linuxfoundation:backstage/plugin-kubernetes-backend	before 0.21.8	NVD
linuxfoundation backstage linuxfoundation:backstage	before 1.54.1	NVD

References

https://github.com/backstage/backstage/security/advisories/GHSA-r9ph-3637-55pxx-refsource-confirm, mitigation, vendor-advisory
https://github.com/backstage/backstage/commit/2d5d3e77d630455d6d48cfa8f31fd3c126fd6f29x-refsource-misc, patch
https://github.com/backstage/backstage/releases/tag/v1.54.1x-refsource-misc, patch, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.