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Back to active CVEs
Medium · CVSS 5.3CVE-2026-106563

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

Answer in brief

CVE-2026-106563 records a Medium severity (CVSS 5.3) vulnerability in Backstage: Improper entity validation in deprecated Kubernetes services endpoint. The current sources do not mark it as known exploited. The current feed maps backstage/backstage (generic), @backstage/plugin-kubernetes-backend (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 7, 2026Updated Oct 7, 2026Source checked Oct 7, 2026First seen by HOL Oct 7, 2026Material review Oct 7, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.3
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps backstage/backstage (generic), @backstage/plugin-kubernetes-backend (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
backstage/backstagegeneric<1.54.11.54.1
@backstage/plugin-kubernetes-backendgeneric<0.21.80.21.8

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for backstage/backstage, @backstage/plugin-kubernetes-backend.
  2. 2Review the reported fix. Update backstage/backstage to 1.54.1; @backstage/plugin-kubernetes-backend to 0.21.8 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 7, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 7, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 7, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Backstage: Remote code execution via crafted markdown_extensions in TechDocs mkdocs.ymlSame backstage/backstage package
  • Backstage: Configuration bypass in TechDocs mkdocs.yml sanitizationSame backstage/backstage package
  • Backstage: Improper validation of TechDocs MkDocs configurationSame backstage/backstage package
  • Backstage: Improper input validation in Confluence to Markdown scaffolder moduleSame backstage/backstage package
  • Backstage: Improper repository path validation in a Scaffolder backend moduleSame backstage/backstage package
  • Backstage: Sensitive information disclosure in Kubernetes resource queriesSame backstage/backstage package

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-20, CWE-862
Source
CVE List V5
Source checked
Oct 7, 2026
References
3 linked sources
Open source record