Is CVE-2026-58540 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-58540 being exploited in the wild.

How severe is CVE-2026-58540?

High severity, with a CVSS score of 7.8, published 14 July 2026.

Which products and versions are affected?

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

Is there a fix for CVE-2026-58540?

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-2026-58540 attacked?

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

Am I affected by CVE-2026-58540?

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-2026-58540: Microsoft Windows Installer privilege escalation

CVE-2026-58540 · Severity: high · CVSS 7.8 · Published 2026-07-14

A security vulnerability has been identified in the Windows Installer, a core component of the Windows operating system used to manage software installation and maintenance. 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 view sensitive data, delete files, or install malicious software with high-level permissions.

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

Quick answers

Is CVE-2026-58540 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-58540 being exploited in the wild.
How severe is CVE-2026-58540?: High severity, with a CVSS score of 7.8, published 14 July 2026.
Which products and versions are affected?: Microsoft Windows 11 Versions 24H2, 25H2, 26H1; Microsoft Windows 10 Versions 1607, 1809, 21H2, 22H2; Microsoft Windows Server 2012 Standard and Server Core installations.
Is there a fix for CVE-2026-58540?: 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-2026-58540 attacked?: It is attacked with local access, in an operating system.
Am I affected by CVE-2026-58540?: 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

A privilege escalation vulnerability exists in the Windows Installer due to improper authorization (CWE-285). An attacker with low-privileged local access can exploit this flaw to gain SYSTEM-level privileges without requiring any user interaction. The vulnerability affects a wide range of Windows client and server versions, including Windows 10, Windows 11, and Windows Server 2012. Microsoft has released security updates to address this issue, and users are advised to apply the latest patches for their respective operating system versions.

Affected products

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

Timeline

2026-07-14: advisory: Initial disclosure by Microsoft and NVD publication

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58540

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