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VulnerabilitiesJul 30, 2026

VMware fixes three critical flaws allowing auth bypass, VM escapes

Broadcom patches five VMware vulnerabilities, three critical flaws enabling auth bypass and VM escapes

Broadcom released security updates addressing five vulnerabilities in VMware vCenter, ESX, Workstation, and Fusion products. Three critical flaws (CVE-2026-59309, CVE-2026-59310, CVE-2026-47876) allow unauthenticated attackers to bypass authentication, execute arbitrary code, and escape from virtual machines to the host system with CVSS scores of 9.8 and 9.3. The company has designated these as emergency fixes requiring immediate patching, though updates will cause temporary service interruptions.

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The lesson from this incident

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Broadcom disclosed three critical vulnerabilities in VMware vCenter, ESXi, Workstation, and Fusion that allow unauthenticated attackers to bypass authentication, execute arbitrary code, and escape virtual machine boundaries to compromise the underlying host. With CVSS scores of 9.8 and 9.3, these flaws represent a severe risk to virtualized infrastructure, which often underpins entire enterprise environments. VM escape vulnerabilities are particularly dangerous because they can allow an attacker who has compromised a guest VM to pivot to the hypervisor and potentially every other VM running on the same host. The emergency designation from Broadcom underscores that the window between disclosure and active exploitation is extremely short for high-profile virtualization platforms, making delayed patching unacceptable.

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Indicators of Compromise

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  • cve — CVE-2026-59309
  • cve — CVE-2026-59310
  • cve — CVE-2026-47876
  • cve — CVE-2026-41703
  • cve — CVE-2026-41709

Entities

Broadcom (vendor)VMware vCenter (product)VMware ESX (product)VMware Workstation (product)VMware Fusion (product)VMXNET3 (product)