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CVE-2026-59309

Vmware Vcenter Server•CRITICAL · CVSS 9.8•No exploitation reported

What is CVE-2026-59309?

VMware vCenter contains an authentication bypass vulnerability in the VMware Directory Service. A malicious actor with network access to vCenter may exploit this issue to bypass authentication and gain unauthorized access to the system.

CVSS9.8 NVD 3.1

SeverityCRITICAL

ExploitationNo exploitation reported

EPSS1% · P49

Triage statusNo Known Exploit

ActionPatch within 48 hours

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWECWE-303

NVD published2026-07-30

NVD last modified2026-08-25

Timeline

2026-07-30Published to the U.S. National Vulnerability Database (NVD)
2026-08-25NVD record last updated

Affected product

Vmware Vcenter Server

NVD also lists CPE entries for: Vmware Vcenter Server, Vmware Telco Cloud Infrastructure, Vmware Telco Cloud Platform, Vmware Cloud Foundation, Vmware Vsphere Foundation

Remediation Steps

Apply Broadcom security updates for VMware vCenter, ESX, Workstation, and Fusion
Review vCenter access logs for unauthorized authentication bypasses or administrative actions
Restrict network access to vCenter management interface to trusted administrative networks
Enable enhanced logging and monitoring for vCenter authentication events
Rotate vCenter administrative credentials after patching

References

Referenced in our briefings & reports

Vulnerability Priority Report – Week 4 of July 2026 (July 27 – August 2)

Related vulnerabilities

CVE-2026-59310 – Broadcom VMware VCenter (same product)

VMware: 29 known exploited vulnerabilities (CISA KEV) →

Browse all tracked CVEs in the defend.network CVE database →

🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.