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Microsoft has published security advisories for CVE-2026-40402, a Windows Hyper-V Elevation of Privilege vulnerability listed in the Microsoft Security Update Guide. The flaw affects Hyper-V, Microsoft's virtualization platform, and could allow an attacker to gain elevated privileges on a vulnerable system.
The advisory was released through Microsoft's public update channels, including the Security Update Guide and MSRC advisory pages, but no public synopsis or technical details were provided in the referenced notices. Organizations using Windows Hyper-V should review Microsoft's guidance for affected versions, patch availability, and any mitigation steps tied to CVE-2026-40402.
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Microsoft added CVE-2026-40402, a Windows Hyper-V Elevation of Privilege vulnerability, to its Security Update Guide. The references indicate public disclosure via Microsoft's advisory pages on the same date.
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Microsoft disclosed and patched several **Windows Hyper-V elevation of privilege vulnerabilities** tracked as `CVE-2022-21901`, `CVE-2023-36427`, `CVE-2024-43624`, and `CVE-2025-54098`. The advisories identify a recurring security issue affecting Hyper-V components, including one flaw specifically tied to **Hyper-V Shared Virtual Disk**, with each entry published through Microsoft's Security Update Guide and related advisory portals. The vulnerabilities could allow attackers to gain higher privileges on affected Windows systems running Hyper-V, increasing the risk to virtualized environments and hosts that rely on Microsoft's hypervisor stack. Organizations using Hyper-V should review the relevant Microsoft advisories, determine exposure across guest and host infrastructure, and prioritize deployment of the corresponding security updates to reduce the chance of privilege escalation in enterprise virtualization deployments.
Jul 8, 2026
Microsoft published Security Update Guide entries for several CVEs affecting its products, including **Windows Hyper-V Information Disclosure Vulnerability** `CVE-2023-36406` and additional advisories for `CVE-2024-26188`, `CVE-2025-21271`, `CVE-2025-21274`, `CVE-2025-21302`, `CVE-2026-24285`, and `CVE-2026-25177`. The references indicate a continuing stream of vulnerability disclosures across Microsoft’s ecosystem, with Hyper-V specifically identified in one advisory as an information disclosure issue. The available records provide limited technical detail, but they show Microsoft tracking and publishing these flaws through the MSRC Security Update Guide and portal advisories. For defenders, the immediate takeaway is to review the listed CVEs in Microsoft’s update channels, determine product exposure across Windows and virtualization environments, and prioritize remediation or compensating controls where affected systems are present.
Jul 8, 2026
Microsoft published security advisories for two **Win32k Elevation of Privilege** flaws, tracked as `CVE-2023-36011` and `CVE-2024-43636`, in its Security Update Guide. Both issues affect the Windows **Win32k** subsystem, a core component involved in graphical and kernel-level operations, and successful exploitation could allow an attacker to gain elevated privileges on a targeted system. The advisories indicate that Microsoft addressed the vulnerabilities through security updates and added them to its official guidance portal for customer remediation. Organizations running affected Windows systems should review the relevant Microsoft advisories, verify patch deployment, and prioritize remediation because privilege-escalation flaws in **Win32k** are commonly valuable for post-compromise activity and local escalation chains.
Jul 8, 2026