Is CVE-2026-58545 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-58545 being exploited in the wild.

How severe is CVE-2026-58545?

Medium severity, with a CVSS score of 5.5, published 14 July 2026.

Which products and versions are affected?

Microsoft Windows 11 24H2, 25H2, 26H1; Microsoft Windows 10 1607, 1809, 21H2, 22H2; Microsoft Windows Server 2012 Standard and Server Core.

Is there a fix for CVE-2026-58545?

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-2026-58545 attacked?

It is attacked with local access, in an operating system.

Am I affected by CVE-2026-58545?

Check whether you run Microsoft Windows 11, Microsoft Windows 10 or Microsoft Windows Server 2012 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.

CVE-2026-58545: Microsoft Windows Kernel security feature bypass

CVE-2026-58545 · Severity: medium · CVSS 5.5 · Published 2026-07-14

A security vulnerability exists in the core of the Windows operating system that could allow a user who already has access to a computer to bypass certain security protections. While an attacker must already be able to log in to the system, this flaw could allow them to access information they are not supposed to see. Microsoft has released security updates to address this issue across various versions of Windows and Windows Server.

Technologies: Microsoft Windows 11, Microsoft Windows 10, Microsoft Windows Server 2012. Vendors: Microsoft.

Quick answers

Is CVE-2026-58545 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-58545 being exploited in the wild.
How severe is CVE-2026-58545?: Medium severity, with a CVSS score of 5.5, published 14 July 2026.
Which products and versions are affected?: Microsoft Windows 11 24H2, 25H2, 26H1; Microsoft Windows 10 1607, 1809, 21H2, 22H2; Microsoft Windows Server 2012 Standard and Server Core.
Is there a fix for CVE-2026-58545?: 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-2026-58545 attacked?: It is attacked with local access, in an operating system.
Am I affected by CVE-2026-58545?: Check whether you run Microsoft Windows 11, Microsoft Windows 10 or Microsoft Windows Server 2012 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 improper access control vulnerability (CWE-284) exists in the Windows Kernel. A locally authenticated attacker with low privileges can exploit this flaw to bypass security feature protections, potentially leading to unauthorized information disclosure. The attack requires local system access but no user interaction. Microsoft has addressed this vulnerability in the July 2026 security updates for affected versions of Windows 10, Windows 11, and Windows Server 2012.

Affected products

Microsoft Windows 10 1607, 1809, 21H2, 22H2
Microsoft Windows 11 24H2, 25H2, 26H1
Microsoft Windows Server 2012 Standard and Server Core

Timeline

2026-07-14: disclosed
2026-07-14: advisory

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58545

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