# Microsoft Windows 11 Version 26H1 vulnerabilities

Source: https://junglewise.ai/threats/technologies/windows-11-version-26h1  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 11 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/windows-11-version-26h1.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 135 vulnerabilities in Microsoft Windows 11 Version 26H1: 0 in the last 7 days and 0 in the last 90 days, 3 of them critical and 1 exploited in the wild. The most recent, CVE-2026-68820, was published on 11 August 2026.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 135 (3 critical, 1 exploited in the wild)

## About Microsoft Windows 11 Version 26H1

An operating system version for personal computers.

## Latest Microsoft Windows 11 Version 26H1 vulnerabilities

- [CVE-2026-68820: Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.](https://junglewise.ai/threats/cve-2026-68820-microsoft-windows-ancillary-function-driver-for-winsock-use-after) (critical, exploited in the wild, CVSS 7, published 11 Aug 2026)
- [CVE-2026-58598: Microsoft Windows Backup Engine privilege escalation](https://junglewise.ai/threats/cve-2026-58598-microsoft-windows-backup-engine-privilege-escalation) (high, CVSS 7, published 16 Jul 2026)
- [CVE-2026-58634: Microsoft Windows Desktop Window Manager privilege escalation](https://junglewise.ai/threats/cve-2026-58634-microsoft-windows-desktop-window-manager-privilege-escalation) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-58633: Microsoft Windows Desktop Window Manager use after free privilege escalation](https://junglewise.ai/threats/cve-2026-58633-microsoft-windows-desktop-window-manager-use-after-free-privilege) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-58626: Microsoft Windows Remote Desktop Services use after free](https://junglewise.ai/threats/cve-2026-58626-microsoft-windows-remote-desktop-services-use-after-free) (high, CVSS 8.8, published 14 Jul 2026)
- [CVE-2026-58544: Microsoft Windows Management Services use after free privilege escalation](https://junglewise.ai/threats/cve-2026-58544-microsoft-windows-management-services-use-after-free-privilege) (high, CVSS 7, published 14 Jul 2026)
- [CVE-2026-58543: Microsoft Windows USB Print Driver privilege escalation](https://junglewise.ai/threats/cve-2026-58543-microsoft-windows-usb-print-driver-privilege-escalation) (medium, CVSS 6.3, published 14 Jul 2026)
- [CVE-2026-58542: Microsoft Windows Media heap overflow code execution](https://junglewise.ai/threats/cve-2026-58542-microsoft-windows-media-heap-overflow-code-execution) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-58537: Microsoft Windows NAT Helper Components use after free privilege escalation](https://junglewise.ai/threats/cve-2026-58537-microsoft-windows-nat-helper-components-use-after-free-privilege) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-58529: Microsoft AD FS out-of-bounds read information disclosure](https://junglewise.ai/threats/cve-2026-58529-microsoft-ad-fs-out-of-bounds-read-information-disclosure) (high, CVSS 7.1, published 14 Jul 2026)
- [CVE-2026-58527: Microsoft Windows Runtime privilege escalation via race condition](https://junglewise.ai/threats/cve-2026-58527-microsoft-windows-runtime-privilege-escalation-via-race-condition) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-56187: Microsoft Windows MIDI Service Module use after free privilege escalation](https://junglewise.ai/threats/cve-2026-56187-microsoft-windows-midi-service-module-use-after-free-privilege) (high, CVSS 7, published 14 Jul 2026)
- [CVE-2026-56184: Microsoft Windows Win32K information disclosure](https://junglewise.ai/threats/cve-2026-56184-microsoft-windows-win32k-information-disclosure) (medium, CVSS 5.5, published 14 Jul 2026)
- [CVE-2026-56183: Microsoft Windows MIDI Service privilege escalation](https://junglewise.ai/threats/cve-2026-56183-microsoft-windows-midi-service-privilege-escalation) (high, CVSS 7, published 14 Jul 2026)
- [CVE-2026-56181: Microsoft Windows NAT origin validation error spoofing](https://junglewise.ai/threats/cve-2026-56181-microsoft-windows-nat-origin-validation-error-spoofing) (high, CVSS 8.3, published 14 Jul 2026)
- [CVE-2026-56173: Microsoft Windows WebView use after free privilege escalation](https://junglewise.ai/threats/cve-2026-56173-microsoft-windows-webview-use-after-free-privilege-escalation) (high, CVSS 7, published 14 Jul 2026)
- [CVE-2026-56168: Microsoft Windows SMB Server null pointer dereference](https://junglewise.ai/threats/cve-2026-56168-microsoft-windows-smb-server-null-pointer-dereference) (medium, CVSS 6.5, published 14 Jul 2026)
- [CVE-2026-50687: Microsoft Windows Kernel use after free privilege escalation](https://junglewise.ai/threats/cve-2026-50687-microsoft-windows-kernel-use-after-free-privilege-escalation) (high, CVSS 8.8, published 14 Jul 2026)
- [CVE-2026-50682: Microsoft Windows Active Directory out-of-bounds read](https://junglewise.ai/threats/cve-2026-50682-microsoft-windows-active-directory-out-of-bounds-read) (high, CVSS 7.1, published 14 Jul 2026)
- [CVE-2026-50679: Microsoft Windows Search Component heap overflow privilege escalation](https://junglewise.ai/threats/cve-2026-50679-microsoft-windows-search-component-heap-overflow-privilege) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-50677: Microsoft Windows Media use after free privilege escalation](https://junglewise.ai/threats/cve-2026-50677-microsoft-windows-media-use-after-free-privilege-escalation) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-50676: Microsoft Windows Media privilege escalation via race condition](https://junglewise.ai/threats/cve-2026-50676-microsoft-windows-media-privilege-escalation-via-race-condition) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-50674: Microsoft Windows USB Print Driver use after free privilege escalation](https://junglewise.ai/threats/cve-2026-50674-microsoft-windows-usb-print-driver-use-after-free-privilege) (high, CVSS 7, published 14 Jul 2026)
- [CVE-2026-50668: Microsoft Windows NTFS heap overflow privilege escalation](https://junglewise.ai/threats/cve-2026-50668-microsoft-windows-ntfs-heap-overflow-privilege-escalation) (medium, CVSS 6.8, published 14 Jul 2026)
- [CVE-2026-50655: Microsoft Windows Media heap buffer overflow](https://junglewise.ai/threats/cve-2026-50655-microsoft-windows-media-heap-buffer-overflow) (high, CVSS 7.8, published 14 Jul 2026)

## Most severe Microsoft Windows 11 Version 26H1 vulnerabilities

- [CVE-2026-68820: Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.](https://junglewise.ai/threats/cve-2026-68820-microsoft-windows-ancillary-function-driver-for-winsock-use-after) (critical, exploited in the wild, CVSS 7, published 11 Aug 2026)
- [CVE-2026-54990: Microsoft Remote Desktop Client heap overflow remote code execution](https://junglewise.ai/threats/cve-2026-54990-microsoft-remote-desktop-client-heap-overflow-remote-code) (critical, CVSS 9.8, published 14 Jul 2026)
- [CVE-2026-49172: Microsoft Windows FTP Service heap overflow remote code execution](https://junglewise.ai/threats/cve-2026-49172-microsoft-windows-ftp-service-heap-overflow-remote-code-execution) (critical, CVSS 9.8, published 14 Jul 2026)
- [CVE-2026-58626: Microsoft Windows Remote Desktop Services use after free](https://junglewise.ai/threats/cve-2026-58626-microsoft-windows-remote-desktop-services-use-after-free) (high, CVSS 8.8, published 14 Jul 2026)
- [CVE-2026-50687: Microsoft Windows Kernel use after free privilege escalation](https://junglewise.ai/threats/cve-2026-50687-microsoft-windows-kernel-use-after-free-privilege-escalation) (high, CVSS 8.8, published 14 Jul 2026)
- [CVE-2026-50413: Microsoft Windows Runtime use after free privilege escalation](https://junglewise.ai/threats/cve-2026-50413-microsoft-windows-runtime-use-after-free-privilege-escalation) (high, CVSS 8.8, published 14 Jul 2026)
- [CVE-2026-50398: Microsoft Windows Media race condition privilege escalation](https://junglewise.ai/threats/cve-2026-50398-microsoft-windows-media-race-condition-privilege-escalation) (high, CVSS 8.8, published 14 Jul 2026)
- [CVE-2026-50385: Microsoft Windows Runtime privilege escalation via race condition](https://junglewise.ai/threats/cve-2026-50385-microsoft-windows-runtime-privilege-escalation-via-race-condition) (high, CVSS 8.8, published 14 Jul 2026)
- [CVE-2026-50369: Microsoft Windows Remote Desktop Services privilege escalation](https://junglewise.ai/threats/cve-2026-50369-microsoft-windows-remote-desktop-services-privilege-escalation) (high, CVSS 8.8, published 14 Jul 2026)
- [CVE-2026-50342: Microsoft Windows MIDI Service Module privilege escalation](https://junglewise.ai/threats/cve-2026-50342-microsoft-windows-midi-service-module-privilege-escalation) (high, CVSS 8.8, published 14 Jul 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Other Microsoft technologies

- [Microsoft Windows](https://junglewise.ai/threats/technologies/windows): 2,362 vulnerabilities
- [Microsoft Windows 10](https://junglewise.ai/threats/technologies/windows-10): 589 vulnerabilities
- [Microsoft Windows 11 24h2](https://junglewise.ai/threats/technologies/windows-11-24h2): 565 vulnerabilities
- [Microsoft Windows 11 25h2](https://junglewise.ai/threats/technologies/windows-11-25h2): 534 vulnerabilities
- [Microsoft Windows Server 2025](https://junglewise.ai/threats/technologies/windows-server-2025): 534 vulnerabilities
- [Microsoft Windows Server 2022](https://junglewise.ai/threats/technologies/windows-server-2022): 528 vulnerabilities
- [Microsoft Windows Server 2019](https://junglewise.ai/threats/technologies/windows-server-2019): 521 vulnerabilities
- [Microsoft Windows Server 2012](https://junglewise.ai/threats/technologies/windows-server-2012): 517 vulnerabilities
- [Microsoft Windows 11](https://junglewise.ai/threats/technologies/windows-11): 494 vulnerabilities
- [Microsoft Windows Server 2016](https://junglewise.ai/threats/technologies/windows-server-2016): 476 vulnerabilities
- [Microsoft Windows 10 1809](https://junglewise.ai/threats/technologies/windows-10-1809): 380 vulnerabilities
- [Microsoft Windows 10 21h2](https://junglewise.ai/threats/technologies/windows-10-21h2): 373 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Microsoft Windows 11 Version 26H1 vulnerabilities", https://junglewise.ai/threats/technologies/windows-11-version-26h1, 11 November 2026.