CRITICALVulnerability
Verified
Global

Critical RCE Chain in Microsoft Azure Kubernetes Service Exposes Cloud Workloads

Saturday, March 28, 2026 at 08:00 PM UTC·Source: Microsoft MSRC / Wiz Research

Updated: Sunday, March 29, 2026 at 02:00 PM UTC

Executive Summary

Three chained vulnerabilities in Azure AKS allow container escape and host node RCE. 40% of AKS clusters were vulnerable before patching.

Analysis

Wiz Research discovered a chain: CVE-2026-21345 (OverlayFS container escape), CVE-2026-21346 (kubelet auth bypass), CVE-2026-21347 (RBAC privilege escalation to cluster-admin). Microsoft has auto-patched managed clusters.

Timeline

Discovered
Mar 15, 2026
Published
Mar 28, 2026
Patch Available
Mar 28, 2026

Indicators of Compromise (3)

CVE (3)
CVE-2026-21345
NVDMITRE CVE
CVE-2026-21346
NVDMITRE CVE
CVE-2026-21347
NVDMITRE CVE
Source Attribution

Originally published by Microsoft MSRC / Wiz Research on Mar 28, 2026. Verified by: Microsoft, Wiz Research, CISA.

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