VulnerabilityAnalyzed

CVE-2026-106563

Prior to 0.21.8, the @backstage/plugin-kubernetes-backend package is affected by improper entity validation in deprecated kubernetes services endpoint.

MEDIUM 6.5EPSS 0.22%

Does this matter?

Lower severity and a low EPSS score (0.22%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 3.1: 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS: 0.22% probability · 13th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-20, CWE-862
Affected: linuxfoundation/backstage\/plugin-kubernetes-backend · linuxfoundation/backstage
Source: security-advisories@github.com

EPSS trend

EPSS moved from 0.2% on 8 October 2026 to 0.2% on 26 October 2026.

References

https://github.com/backstage/backstage/commit/2d5d3e77d630455d6d48cfa8f31fd3c126fd6f29Patch
https://github.com/backstage/backstage/releases/tag/v1.54.1Patch, Release Notes
https://github.com/backstage/backstage/security/advisories/GHSA-r9ph-3637-55pxMitigation, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.