CVE-2026-59309: vCenter authentication-bypass vulnerability
Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.
Generated by VEDAS. Scores as of 2026-11-01 19:19 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.
What it is
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.
Description quoted from the CVE record (assigned by vmware, published 2026-07-30).
Weakness: CWE-303 Incorrect implementation of authentication algorithm
How it can be exploited
Exploitable over the network with low attack complexity needing no privileges and no user interaction. Impact: confidentiality high, integrity high, availability high. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA assessment (SSVC): CISA has no evidence of exploitation. Automatable: yes. Technical impact: total.
Public exploit evidence (Exploit Observer)
Also known as: BDU:2026-11334, EUVD-2026-51098, GHSA-fcv2-9hgc-5mgq
Exploit Observer has no public exploit code that names this CVE or one of its aliases.
Research and write-ups (1)
- Research or write-up: https://mobeta.fr/blog/vcenter-cve-2026-59309-cve-2026-59310
Vulnerability databases and vendor advisories (4)
Catalogue entries, not exploit evidence.
- Vulnerability database or vendor advisory: https://euvd.enisa.europa.eu/enisa/EUVD-2026-51098
- Vulnerability database or vendor advisory: https://github.com/advisories/GHSA-fcv2-9hgc-5mgq
- Vulnerability database or vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-59309
- Vulnerability database or vendor advisory: https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/VMSA-2026-0006--VMware-ESX--vCenter--Workstation--and-Fusion-updates-address-multiple-vulnerabilities--CVE-2026-59309--CVE-2026-59310--CVE-2026-47876--CVE-2026-41703--CVE-2026-41709-/38017
7 more references returned by Exploit Observer did not name this CVE or an alias, so they are left out.
VEDAS data as of 2026-11-01T17:12 UTC; fetched 2026-11-02.
Live scores
- EPSS
- 0.006
low predicted chance of attack - VEDAS
- 0.412
little exploit evidence - On CISA KEV
- Not listed
- Detection rule
- None yet
Who is affected
| Product | Affected | Not affected |
|---|---|---|
| VMware Cloud Foundation | version 9.1.x.x version 9.0.x.x version 5.x | Not stated |
| VMware vSphere Foundation | version 9.1.x.x version 9.0.x.x | Not stated |
| VMware vCenter | from 9.1.x.x before 9.1.0.0300 from 9.0.x.x before 9.0.2.0100 from 8.0 before 8.0 U3k | Not stated |
| VMware Telco Cloud Infrastructure | version 3.0 | Not stated |
| VMware Telco Cloud Platform | version 5.1.x version 5.0.x version 4.x version 3.0 | Not stated |
Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.
Exploit Observer also maps it to: broadcom_inc. vmware_cloud_foundation, broadcom_inc. vmware_telco_cloud_infrastructure, broadcom_inc. vmware_telco_cloud_platform, broadcom_inc. vmware_vcenter_server, broadcom_inc. vmware_vsphere_foundation, vmware vcenter_server.
How to fix it
Fixed versions stated in the CVE record: 9.1.0.0300, 9.0.2.0100, 8.0 U3k.
How to detect it
There is no open VEDAS detection rule for this bug yet. It is listed on the detection gaps page if CISA has confirmed attacks.
Advisories on this CVE
- VMware vCenter Syslog directory traversal to RCE (CVE-2026-59310, plus CVE-2026-59309) (18 Aug 2026)
References
Other references
Other databases
Where this comes from
This advisory is generated automatically by VEDAS from: CVE.org record, cve-scores (EPSS and VEDAS), Exploit Observer. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.