Security Bulletin
Summary
Vulnerabilities in VMware ESXi and vCenter affect IBM Cloud Pak System. IBM Cloud Pak System version 2.3.6.2 has addressed these vulnerabilities. Cloud Pak Sytem has updated Platform System Manager (PSM) and workload nodes to VMware ESXi 83U3k and VMware vCenter to VCSA 83U3k.
Vulnerability Details
CVEID: CVE-2026-59309
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.
CWE: CWE-303: Incorrect Implementation of Authentication Algorithm
CVSS Source: security@vmware.com
CVSS Base score: 9.8
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
CVEID: CVE-2026-59310
DESCRIPTION: VMware vCenter contains a directory traversal vulnerability in the Syslog server. A malicious actor with network access to vCenter may exploit this issue to execute arbitrary code.
CWE: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CVSS Source: security@vmware.com
CVSS Base score: 9.8
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
CVEID: CVE-2026-47876
DESCRIPTION: VMware ESX contains an out-of-bounds write vulnerability in the VMXNET3 virtual network adapter. A malicious actor with local administrative privileges on a virtual machine with VMXNET3 virtual network adapter may exploit this issue to execute code on the host. Non VMXNET3 virtual adapters are not affected by this issue.
CWE: CWE-787: Out-of-bounds Write
CVSS Source: security@vmware.com
CVSS Base score: 9.3
CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H)
CVEID: CVE-2026-41703
DESCRIPTION: VMware ESX, Workstation, and Fusion contain an out-of-bounds read vulnerability. A malicious actor with VM deployment privileges could trigger an out-of-bounds read, potentially leading to information disclosure or more likely a Denial-of-Service (DoS) condition of the host process. On Workstation and Fusion, the impact of this vulnerability is restricted to information disclosure.
CWE: CWE-125: Out-of-bounds Read
CVSS Source: security@vmware.com
CVSS Base score: 7.6
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:L)
CVEID: CVE-2026-41709
DESCRIPTION: VMware ESX contains an insufficient logging vulnerability. A malicious administrator could exploit this issue to perform certain operations without them being logged.
CWE: CWE-778: Insufficient Logging
CVSS Source: security@vmware.com
CVSS Base score: 2.7
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| IBM Cloud Pak System | 2.3.6.0 |
| IBM Cloud Pak System | 2.3.6.1 |
Remediation/Fixes
IBM strongly recommends addressing the vulnerability now by upgrading to version 2.3.6.2.
IBM Cloud Pak System V2.3.6.2, update both Platform Systems Manager (PSM) and the workload nodes to VMware ESXi 80u3k. In addition, update vCenter to vCenter 80u3k.
Customers can contact IBM support/open case to SWAT.
Information on upgrading here https://www.ibm.com/support/pages/node/7284365
For unsupported versions the recommendation is to upgrade to supported version of the product.
Workarounds and Mitigations
None
Get Notified about Future Security Bulletins
References
Acknowledgement
Change History
01 Oct 2026: Initial Publication
*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.
Disclaimer
According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.
Document Location
Worldwide
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Document Information
Modified date:
01 October 2026
Initial Publish date:
01 October 2026
UID
ibm17288405