CVE-2026-56184: Microsoft Windows Win32K information disclosure

CVE-2026-56184 · Severity: medium · CVSS 5.5 · Published 2026-07-14

A security vulnerability exists in the Windows Win32K component, which manages graphics and windowing for the operating system. An attacker who already has basic access to a computer could exploit this flaw to view sensitive information that should normally be protected. This could lead to the exposure of system secrets or data belonging to other users on the same machine.

Technologies: Microsoft Windows 11, Microsoft Windows 10, Microsoft Windows Server 2022, Microsoft Windows Server 2025. Vendors: Microsoft.

Quick answers

Is CVE-2026-56184 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-56184 being exploited in the wild.
How severe is CVE-2026-56184?
Medium severity, with a CVSS score of 5.5, published 14 July 2026.
Which products and versions are affected?
Microsoft Windows 11 10.0.26100.0 to 10.0.26100.8875; Microsoft Windows 10 10.0.19044.0 to 10.0.19044.7548; Microsoft Windows Server 2022 10.0.20348.0 to 10.0.20348.5386; Microsoft Windows Server 2025 10.0.26100.0 to 10.0.26100.33158.
Is there a fix for CVE-2026-56184?
A patch was published on 2026-07-14: Security updates released by Microsoft Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-56184 attacked?
It is attacked with local access, in an operating system.
Am I affected by CVE-2026-56184?
Check whether you run Microsoft Windows 11, Microsoft Windows 10, Microsoft Windows Server 2022 or one of the others listed 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

An information disclosure vulnerability exists in the Windows Win32K kernel-mode driver (CWE-200). The flaw allows a locally authenticated attacker with low privileges to bypass security restrictions and read sensitive information from the system's memory. The attack vector is local, meaning the attacker must already have the ability to execute code on the target system. Successful exploitation results in a high impact on confidentiality but does not directly impact system integrity or availability. Microsoft has released security updates to address this issue across affected versions of Windows 10, 11, and Windows Server.

Affected products

  • Microsoft Windows 10 Version 21H2 10.0.19044.0 to 10.0.19044.7548
  • Microsoft Windows 10 Version 22H2 10.0.19045.0 to 10.0.19045.7548
  • Microsoft Windows 11 Version 24H2 10.0.26100.0 to 10.0.26100.8875
  • Microsoft Windows 11 Version 25H2 10.0.26200.0 to 10.0.26200.8875
  • Microsoft Windows 11 version 26H1 10.0.28000.0 to 10.0.28000.2525
  • Microsoft Windows Server 2022 10.0.20348.0 to 10.0.20348.5386
  • Microsoft Windows Server 2025 10.0.26100.0 to 10.0.26100.33158

Timeline

  • 2026-07-14: advisory: Initial publication by Microsoft and NVD
  • 2026-07-14: patched: Security updates released by Microsoft

References

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