EUVD-2026-44299
GHSA-45xc-qv8h-v2m4
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only use-after-free needing an authenticated user (AV:L, PR:L) and a timing race to reallocate freed memory (AC:H); successful EoP grants full C/I/A within unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Use after free in Windows Management Services allows an authorized attacker to elevate privileges locally.
AnalysisAI
Elevation of privilege in Microsoft Windows Management Services lets a low-privileged local user corrupt memory through a use-after-free (CWE-416) and gain higher privileges on Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025. A successful exploit yields high confidentiality, integrity, and availability impact, but the CVSS vector marks high attack complexity, reflecting the race-condition timing typically needed to win a use-after-free. Microsoft has released a patch; there is no public exploit identified at time of analysis and it is not listed in CISA KEV.
Technical ContextAI
The flaw is a use-after-free (CWE-416) in Windows Management Services, a component of the Windows operating system. Use-after-free arises when code continues to reference a heap object after it has been freed, allowing an attacker who can reallocate that freed memory with controlled data to hijack function pointers or object state and redirect execution or corrupt privileged structures. Per the CPE data the affected code ships in the OS layer of Windows 11 version 24H2, 25H2, and 26H1, plus Windows Server 2025 including the Server Core installation, meaning both client and server SKUs on current-generation builds contain the vulnerable component.
RemediationAI
Apply the Microsoft security update for CVE-2026-58544 (patch available per vendor advisory) via Windows Update or WSUS/SCCM/Intune to all affected client and server SKUs; consult https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58544 for the exact fixed KB and build number for each Windows 11 24H2/25H2/26H1 and Windows Server 2025 (including Server Core) release. No standalone workaround was published in the provided data, so patching is the definitive fix. As compensating controls until the update is deployed, limit the number of interactive and authenticated local users on high-value hosts and enforce least privilege so fewer accounts can reach the vulnerable Windows Management Services code path, and monitor for anomalous process privilege changes and repeated service crashes, since a use-after-free exploit often produces access-violation crashes during heap-grooming attempts; note that restricting local logon reduces convenience for administrators and support staff and is only a stopgap, not a fix.
More in Windows Server 2025
View allWindows Internet Shortcut Files (.url) contain an external control vulnerability (CVE-2025-33053, CVSS 8.8) that enables
Windows SMB contains an improper access control vulnerability (CVE-2025-33073, CVSS 8.8) enabling authenticated attacker
Active Directory Domain Services contains an elevation of privilege vulnerability that allows authenticated domain users
Microsoft Scripting Engine contains a type confusion vulnerability allowing unauthorized remote code execution over the
Windows Task Scheduler Elevation of Privilege Vulnerability. Rated high severity (CVSS 8.8), this vulnerability is low a
Remote code execution in Windows IKE Extension (Internet Key Exchange) via double free memory corruption allows unauthen
Local privilege escalation in Microsoft Active Directory Federation Services (AD FS) lets an already-authenticated low-p
A security feature bypass in Microsoft Management Console (MMC) allows attackers to evade security warnings and execute
Privilege escalation in the Windows Ancillary Function Driver for WinSock (afd.sys) allows a locally authenticated attac
Windows CLFS Driver contains an input validation flaw enabling local privilege escalation, yet another CLFS kernel vulne
Windows Ancillary Function Driver for WinSock contains a heap-based buffer overflow enabling local privilege escalation
MSHTML Framework contains a protection mechanism failure (CVE-2026-21513, CVSS 8.8) allowing remote attackers to bypass
Same weakness CWE-416 – Use After Free
View allSame technique Denial Of Service
View allShare
External POC / Exploit Code
Leaving vuln.today