CVE-2026-58633: Microsoft Windows Desktop Window Manager use after free privilege escalation

CVE-2026-58633 · Severity: high · CVSS 7.8 · Published 2026-07-14

A security vulnerability exists in the Microsoft Windows Desktop Window Manager, the component responsible for rendering the visual interface of the operating system. 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 bypass security restrictions, access sensitive data, or install malicious software.

Technologies: Microsoft Windows 11. Vendors: Microsoft.

Quick answers

Is CVE-2026-58633 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-58633 being exploited in the wild.
How severe is CVE-2026-58633?
High severity, with a CVSS score of 7.8, published 14 July 2026.
Which products and versions are affected?
Microsoft Windows 11 10.0.28000.0 to 10.0.28000.2525.
Is there a fix for CVE-2026-58633?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-58633 attacked?
It is attacked with local access, in an operating system.
Am I affected by CVE-2026-58633?
Check whether you run Microsoft Windows 11 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A use-after-free vulnerability (CWE-416) exists within the Microsoft Desktop Window Manager (DWM) component of Windows 11. The flaw is triggered when the system attempts to access memory that has already been deallocated, leading to memory corruption. An attacker with low-privileged local access can exploit this condition to execute arbitrary code with elevated system privileges. The attack requires no user interaction and is categorized with a CVSS base score of 7.8. Microsoft has released security updates to address this issue in Windows 11 version 26H1.

Affected products

  • Microsoft Windows 11 version 26H1 10.0.28000.0 to 10.0.28000.2525

Timeline

  • 2026-07-14: disclosed: Initial publication of CVE-2026-58633 by Microsoft and NVD.
  • 2026-07-14: advisory: Microsoft Security Response Center (MSRC) released the update guide.

References

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