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CVE-2026-59309

CRITICAL 9.8 PoC CATALOGUED ALL-YEARS

Published 2026-07-30 · Last modified 2026-07-30 · vmware · NVD: Analyzed

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.

REPORTED EXPLOITATION

VulnCheck KEV reports exploitation for this CVE. These are source-specific reports; review the details and vendor guidance below.

Exploitation likelihood

0.6%chance of exploitation in 30 days · 49th percentile

○ In CISA KEV● Catalogued PoC◆ SSVC: exploitation none, automatable yes

Impact if exploited

9.8CVSS 3.1 · CRITICAL · CNA

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

Public PoC or exploit resources are catalogued below.

Listed by the named source; Vulnpedia has not tested these resources.

PoC data: JSON

Resource commands

curl -s https://vulnpedia.com/cve/CVE-2026-59309/poc.jsonMachine-readable PoC index for this CVE (for automation).

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked weekly for the full archive, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Vmware

Products Cloud Foundation Vsphere Foundation Vcenter Telco Cloud Infrastructure Telco Cloud Platform Vcenter Server

Weakness (CWE)

  • CWE-303: Incorrect implementation of authentication algorithm

CVSS vector

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

References and research data (JSON)

Additional exploitation reports

Source-specific reports, separate from CISA KEV. Repeated observations from one source are not independent confirmations.

  • VulnCheck KEV · 2026-08-14T00:00:00Z

    Source guidance: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

    Source ransomware assessment: Unknown

    VulnCheck KEV · CVE-2026-59309 · Updated 2026-08-14T00:00:00Z
  • VulnCheck KEV · 2026-08-14T00:00:00ZVulnCheck KEV · CVE-2026-59309

Known Affected Software Configurations

VendorProductVersion range
VmwareVcenter Server< 8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server8.0
VmwareVcenter Server≥ 9.0 and < 9.0.2.0100
VmwareVcenter Server≥ 9.1 and < 9.1.0.0300

All CVSS metrics

  • CRITICAL 9.8 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • CRITICAL 9.8 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Advisories

Technical & other

Sources: NVD · CVE.org · All sources and attribution · EPSS