vCluster Platform provides a Kubernetes platform for managing virtual clusters, multi-tenancy, and cluster sharing…
Summary
Cross-site scripting reported (CVE-2026-42457). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 4.4.3 or later.
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-42457 has been found.
Successful exploitation can lead to full system takeover. CVSS score: 9.0/10.
What to do: upgrade the affected software to 4.4.3 or later.
If unsure, ask your IT team or search "CVE-2026-42457" on the vendor's site.
CVE-2026-42457 — CWE-79 / CVSS v3 9.0
Attack vector: remote (network-reachable)
Patched: 4.4.3 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Cross-site scripting (XSS) (CWE-79) has been reported.
Check the vendor advisory for the affected versions.
Severity: Critical (CVSS 9.0/10). Successful exploitation can lead to full system takeover.
Update to 4.4.3.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1
Identify exposureidentify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで影響コンポーネントを特定する。
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2
Apply patchpatch
Upgrade to 4.4.3ステージング環境で 4.4.3 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3
Post-deployment verificationverify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Original description The description as published by the source.
vCluster Platform provides a Kubernetes platform for managing virtual clusters, multi-tenancy, and cluster sharing. Prior to 4.4.3, 4.5.5, 4.6.2, 4.7.1, and 4.8.0, there is a Stored XSS attack vulnerability via the name field of a templateRef. This can lead to the execution of arbitrary external scripts within the platform's browser context. In the worst case, a malicious user could potentially create a new Global-Admin user, bypassing other security restrictions. The attacker needs the ability to create namespaces. This vulnerability is fixed in 4.4.3, 4.5.5, 4.6.2, 4.7.1, and 4.8.0.
Source: NIST National Vulnerability Database NVD GitHub Advisory
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov