Microsoft Windows Deployment Services Use-After-Free Remote Code Execution Vulnerability

August 11th, 2026
ZDI-26-544 ZDI-CAN-31889

CVE ID

CVE-2026-62893

CVSS Score

7.5 AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors

Microsoft

Affected Products

Windows

Vulnerability Details

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Microsoft Windows Server. Authentication is not required to exploit this vulnerability. However, only systems with Windows Deployment Services enabled are vulnerable.

The specific flaw exists within the WDSServer service. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code in the context of SYSTEM.

Additional Details

Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62893

Disclosure Timeline

  • 2026-06-18 - Vulnerability reported to vendor
  • 2026-08-11 - Coordinated public release of advisory
  • 2026-08-11 - Advisory Updated

Credit

Nikolai Skliarenko of TrendAI Research

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