Technology · Microsoft
Microsoft Windows 11 Version 26H1 vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 135 vulnerabilities in Microsoft Windows 11 Version 26H1: 0 in the last 7 days and 129 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.
- Last 7 days
- 0
- Last 90 days
- 129
- Critical, all time
- 3
- Exploited in the wild
- 1
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.criticalexploited in the wildCVSS 7EPSS 0.3%
- CVE-2026-58598: Microsoft Windows Backup Engine privilege escalationhighCVSS 7
- CVE-2026-58634: Microsoft Windows Desktop Window Manager privilege escalationhighCVSS 7.8
- CVE-2026-58633: Microsoft Windows Desktop Window Manager use after free privilege escalationhighCVSS 7.8
- CVE-2026-58626: Microsoft Windows Remote Desktop Services use after freehighCVSS 8.8
- CVE-2026-58544: Microsoft Windows Management Services use after free privilege escalationhighCVSS 7
- CVE-2026-58543: Microsoft Windows USB Print Driver privilege escalationmediumCVSS 6.3
- CVE-2026-58542: Microsoft Windows Media heap overflow code executionhighCVSS 7.8
- CVE-2026-58537: Microsoft Windows NAT Helper Components use after free privilege escalationhighCVSS 7.8
- CVE-2026-58529: Microsoft AD FS out-of-bounds read information disclosurehighCVSS 7.1
- CVE-2026-58527: Microsoft Windows Runtime privilege escalation via race conditionhighCVSS 7.8
- CVE-2026-56187: Microsoft Windows MIDI Service Module use after free privilege escalationhighCVSS 7
- CVE-2026-56184: Microsoft Windows Win32K information disclosuremediumCVSS 5.5
- CVE-2026-56183: Microsoft Windows MIDI Service privilege escalationhighCVSS 7
- CVE-2026-56181: Microsoft Windows NAT origin validation error spoofinghighCVSS 8.3
- CVE-2026-56173: Microsoft Windows WebView use after free privilege escalationhighCVSS 7
- CVE-2026-56168: Microsoft Windows SMB Server null pointer dereferencemediumCVSS 6.5
- CVE-2026-50687: Microsoft Windows Kernel use after free privilege escalationhighCVSS 8.8
- CVE-2026-50682: Microsoft Windows Active Directory out-of-bounds readhighCVSS 7.1
- CVE-2026-50679: Microsoft Windows Search Component heap overflow privilege escalationhighCVSS 7.8
- CVE-2026-50677: Microsoft Windows Media use after free privilege escalationhighCVSS 7.8
- CVE-2026-50676: Microsoft Windows Media privilege escalation via race conditionhighCVSS 7.8
- CVE-2026-50674: Microsoft Windows USB Print Driver use after free privilege escalationhighCVSS 7
- CVE-2026-50668: Microsoft Windows NTFS heap overflow privilege escalationmediumCVSS 6.8
- CVE-2026-50655: Microsoft Windows Media heap buffer overflowhighCVSS 7.8
Most severe Microsoft Windows 11 Version 26H1 vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2026-68820: Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.criticalexploited in the wildCVSS 7EPSS 0.3%
- CVE-2026-54990: Microsoft Remote Desktop Client heap overflow remote code executioncriticalCVSS 9.8
- CVE-2026-49172: Microsoft Windows FTP Service heap overflow remote code executioncriticalCVSS 9.8
- CVE-2026-58626: Microsoft Windows Remote Desktop Services use after freehighCVSS 8.8
- CVE-2026-50687: Microsoft Windows Kernel use after free privilege escalationhighCVSS 8.8
- CVE-2026-50413: Microsoft Windows Runtime use after free privilege escalationhighCVSS 8.8
- CVE-2026-50398: Microsoft Windows Media race condition privilege escalationhighCVSS 8.8
- CVE-2026-50385: Microsoft Windows Runtime privilege escalation via race conditionhighCVSS 8.8
- CVE-2026-50369: Microsoft Windows Remote Desktop Services privilege escalationhighCVSS 8.8
- CVE-2026-50342: Microsoft Windows MIDI Service Module privilege escalationhighCVSS 8.8
Vulnerabilities per week
The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 29 Jun 2026 | 0 | 0 | |
| 6 Jul 2026 | 0 | 0 | |
| 13 Jul 2026 | 128 | 2 | |
| 20 Jul 2026 | 0 | 0 | |
| 27 Jul 2026 | 0 | 0 | |
| 3 Aug 2026 | 0 | 0 | |
| 10 Aug 2026 | 1 | 1 | |
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 0 | 0 |
How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/technologies/windows-11-version-26h1.json, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "Microsoft Windows 11 Version 26H1 vulnerabilities", https://junglewise.ai/threats/technologies/windows-11-version-26h1, 26 September 2026.