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CVE-2026-59309

VMware Vcenter Server authentication bypass

9.8 CRITICALEPSS 0.61%
  1. Published30 Jul 2026

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

VMware Vcenter Server≥ 9.0 < 9.0.2.0100 · ≥ 9.1 < 9.1.0.0300 · < 8.0 · 8.0

Remediation

Fixed in
VMware Vcenter Server≥ 9.0.2.0100

References

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Frequently asked

Is CVE-2026-59309 being actively exploited?

CVE-2026-59309 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.61%.

How severe is CVE-2026-59309?

CVE-2026-59309 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.61% probability of exploitation.

Which products are affected by CVE-2026-59309?

Affected products include VMware Vcenter Server.

How do I fix CVE-2026-59309?

Upgrade affected software to a fixed version, for example VMware Vcenter Server 9.0.2.0100 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-59309 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.