Known vulnerabilities in Microsoft Windows 11 version 26H1
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CVE list
| CVE | Summary | Score | Published |
|---|---|---|---|
| CVE-2026-83921 | Heap-based buffer overflow in Microsoft Windows Search Component allows an authorized attacker to elevate privileges… | 7.0 High | Oct 13, 2026 |
| CVE-2026-83922 | Use after free in Windows Direct Composition allows an authorized attacker to elevate privileges locally | 7.8 High | Oct 13, 2026 |
| CVE-2026-83914 | Use after free in Microsoft XML allows an unauthorized attacker to execute code over a network | 8.1 High | Oct 13, 2026 |
| CVE-2026-83916 | Double free in Windows Error Reporting allows an authorized attacker to execute code locally | 7.0 High | Oct 13, 2026 |
| CVE-2026-83917 | Use after free in Windows ALPC allows an authorized attacker to elevate privileges locally | 7.0 High | Oct 13, 2026 |
| CVE-2026-83926 | Improper certificate validation in Windows Hello allows an authorized attacker to bypass a security feature locally | 4.4 Medium | Oct 13, 2026 |
| CVE-2026-83919 | Heap-based buffer overflow in Microsoft Internet Messaging API allows an authorized attacker to execute code locally | 7.8 High | Oct 13, 2026 |
| CVE-2026-83586 | Weak authentication in Windows Resilient File System (ReFS) Deduplication Service allows an authorized attacker to… | 7.8 High | Oct 13, 2026 |
| CVE-2026-83769 | Use after free in OpenSSH for Windows allows an authorized attacker to elevate privileges locally | 7.8 High | Oct 13, 2026 |
| CVE-2026-83741 | Use after free in Internet Explorer allows an authorized attacker to elevate privileges locally | 7.8 High | Oct 13, 2026 |
| CVE-2026-83911 | Heap-based buffer overflow in Windows Storage allows an authorized attacker to elevate privileges locally | 7.0 High | Oct 13, 2026 |
| CVE-2026-83871 | Heap-based buffer overflow in OpenSSH for Windows allows an authorized attacker to elevate privileges locally | 7.0 High | Oct 13, 2026 |
| CVE-2026-83912 | Use after free in Windows Direct Composition allows an authorized attacker to elevate privileges locally | 7.8 High | Oct 13, 2026 |
| CVE-2026-83906 | Incorrect implementation of authentication algorithm in Windows Shell allows an unauthorized attacker to perform… | 6.5 Medium | Oct 13, 2026 |
| CVE-2026-83886 | Use after free in Windows Update Orchestrator Service allows an authorized attacker to elevate privileges locally | 7.0 High | Oct 13, 2026 |
| CVE-2026-70128 | Out-of-bounds read in HID Parser Library allows an authorized attacker to disclose information locally | 5.5 Medium | Oct 13, 2026 |
| CVE-2026-70151 | Use after free in Windows Direct Composition allows an authorized attacker to elevate privileges locally | 7.8 High | Oct 13, 2026 |
| CVE-2026-70089 | Heap-based buffer overflow in Windows GDI allows an unauthorized attacker to execute code over a network | 8.8 High | Oct 13, 2026 |
| CVE-2026-70163 | Allocation of resources without limits or throttling in OpenSSH for Windows allows an unauthorized attacker to deny… | 7.5 High | Oct 13, 2026 |
| CVE-2026-70222 | Relative path traversal in Windows Shell allows an authorized attacker to elevate privileges locally | 7.8 High | Oct 13, 2026 |
| CVE-2026-70248 | Null pointer dereference in Windows Hyper-V allows an authorized attacker to deny service locally | 6.5 Medium | Oct 13, 2026 |
| CVE-2026-70275 | Untrusted pointer dereference in Windows CD-ROM Driver allows an unauthorized attacker to execute code over a network | 8.8 High | Oct 13, 2026 |
| CVE-2026-70241 | Use after free in Windows Kerberos allows an authorized attacker to elevate privileges locally | 7.0 High | Oct 13, 2026 |
| CVE-2026-70286 | Heap-based buffer overflow in Windows Win32K - GRFX allows an authorized attacker to elevate privileges locally | 7.8 High | Oct 13, 2026 |
| CVE-2026-83569 | Heap-based buffer overflow in HID Parser Library allows an authorized attacker to elevate privileges locally | 7.8 High | Oct 13, 2026 |
Other Microsoft products
Windows Server 2019 5745
Windows Server 2019 (Server Core installation) 5648
Windows 10 Version 1809 5349
Windows Server 2022 5112
Windows Server 2016 5051
Windows Server 2016 (Server Core installation) 4847
Windows 10 Version 21H2 4539
Windows 10 Version 1607 4535
Windows Server 2012 R2 4103
Windows 10 Version 22H2 4041
Windows Server 2012 R2 (Server Core installation) 3958
Windows Server 2012 3865