Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-106563

CVE-2026-106563MEDIUM

Backstage: Improper entity validation in deprecated Kubernetes services endpoint

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  U  H  N  N    6.5   .0022   12.2     —

AFFECTED
  Product                    Versions    Fixed
  backstage                  < 1.54.1 –  —
  plugin-kubernetes-backend  < 0.21.8 –  —

TIMELINE
  Oct 6   Reserved by GitHub_M
  Oct 7   Published (CNA: GitHub_M)
  Oct 16  RESCORED — CVE-2026-106563 (backstage). CVSS 5.3 → 6.5 (NVD).

CWE-20, CWE-862 · CNA: GitHub_M · CVSS v3.1 · 3 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
October 6, 2026	Reserved	Reserved by GitHub_M
October 7, 2026	Published	Published (CNA: GitHub_M)
October 16, 2026	RESCORED	RESCORED — CVE-2026-106563 (backstage). CVSS 5.3 → 6.5 (NVD).

Affected

Affected products and packages — 2 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
backstage	backstage	—	< 1.54.1	—
@backstage	plugin-kubernetes-backend	—	< 0.21.8	—

Weaknesses

CWE-20 · CWE-862

References (3)

https://github.com/backstage/backstage/commit/2d5d3e77d630455d6d48cfa8f31fd3c126fd6f29 [Patch]
https://github.com/backstage/backstage/releases/tag/v1.54.1 [Patch, Release Notes]
https://github.com/backstage/backstage/security/advisories/GHSA-r9ph-3637-55px [Mitigation, Vendor Advisory]

Authoritative record: CVE-2026-106563 at cve.org

Vendors: backstage · @backstage

Weaknesses: CWE-20 · CWE-862

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-106563 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.