Executive brief
A security vulnerability has been identified in the Windows Win32K component, which handles graphics and window management. An attacker who already has basic access to a computer could exploit this flaw to gain full administrative control over the system. This could allow them to access sensitive data, install malicious software, or disrupt business operations.
Technical details
This vulnerability is classified as a Use-After-Free (CWE-416) within the Win32K kernel-mode driver in Microsoft Windows. The flaw occurs when the system continues to use a memory pointer after it has been freed, which can be manipulated to execute arbitrary code in kernel mode. An attacker must have local access and be authenticated with low privileges to exploit this vulnerability. Successful exploitation allows the attacker to gain SYSTEM privileges, effectively bypassing security boundaries on the local machine. Microsoft has released security updates to address this issue across affected versions of Windows 10, 11, and Windows Server.
Affected products
- Microsoft Windows 10 1809, 21H2, 22H2
- Microsoft Windows 11 24H2, 25H2, 26H1
- Microsoft Windows Server 2019 All versions
- Microsoft Windows Server 2022 All versions
Timeline
- 2026-07-14: disclosed
- 2026-07-14: advisory