CVE-2026-50670: Microsoft Windows Kernel privilege escalation via out-of-bounds read

CVE-2026-50670 · Severity: high · CVSS 8.8 · Published 2026-07-14

A security vulnerability exists in the core of the Windows operating system that could allow a user with limited access to gain full administrative control over the computer. This type of flaw is typically used by attackers who have already gained a foothold on a system to deepen their access and bypass security boundaries. If exploited, an attacker could view sensitive data, change system settings, or install malicious software across the entire machine.

Technologies: Microsoft Windows 11, Microsoft Windows 10, Microsoft Windows Server 2019, Microsoft Windows Server 2022. Vendors: Microsoft.

Quick answers

Is CVE-2026-50670 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-50670 being exploited in the wild.
How severe is CVE-2026-50670?
High severity, with a CVSS score of 8.8, published 14 July 2026.
Which products and versions are affected?
Microsoft Windows 11 24H2, 25H2, 26H1; Microsoft Windows 10 1809, 21H2, 22H2; Microsoft Windows Server 2019 All editions; Microsoft Windows Server 2022 All editions.
Is there a fix for CVE-2026-50670?
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-2026-50670 attacked?
It is attacked with local access, in an operating system.
Am I affected by CVE-2026-50670?
Check whether you run Microsoft Windows 11, Microsoft Windows 10, Microsoft Windows Server 2019 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

A local privilege escalation vulnerability exists in the Windows Kernel due to improper input validation leading to an out-of-bounds read and heap-based buffer overflow. An attacker with low-privileged local access can exploit this flaw to execute code in kernel mode. Successful exploitation allows the attacker to escape security sandboxes and gain SYSTEM-level privileges. The vulnerability affects multiple versions of Windows 10, Windows 11, and Windows Server; patches are available via Microsoft's Security Update Guide.

Affected products

  • Microsoft Windows 10 1809, 21H2, 22H2
  • Microsoft Windows 11 24H2, 25H2, 26H1
  • Microsoft Windows Server 2019 All editions
  • Microsoft Windows Server 2022 All editions

Timeline

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

References

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