# Microsoft Windows Server vulnerabilities

Source: https://junglewise.ai/threats/technologies/windows-server  
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-server.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 17 vulnerabilities in Microsoft Windows Server: 1 in the last 7 days and 5 in the last 90 days, 4 of them critical and 2 exploited in the wild. The most recent, CVE-2026-88243, was published on 10 November 2026. Nothing was published in the last eight weeks.

## Counts

- Last 7 days: 1
- Last 30 days: 1
- Last 90 days: 5
- All time: 17 (4 critical, 2 exploited in the wild)

## About Microsoft Windows Server

Server operating system for managing network infrastructure and enterprise applications.

## Latest Microsoft Windows Server vulnerabilities

- [CVE-2026-88243: Microsoft Windows DHCP Server out-of-bounds read](https://junglewise.ai/threats/cve-2026-88243-out-of-bounds-read-in-windows-dhcp-server-allows-an-unauthorized) (critical, CVSS 9.8, published 10 Nov 2026)
- [CVE-2026-77499: Microsoft Windows DHCP Server type confusion denial of service](https://junglewise.ai/threats/cve-2026-77499-microsoft-windows-dhcp-server-type-confusion-denial-of-service) (high, CVSS 7.5, published 8 Sep 2026)
- [CVE-2026-69821: Microsoft Active Directory Certificate Services privilege escalation](https://junglewise.ai/threats/cve-2026-69821-microsoft-active-directory-certificate-services-privilege) (high, CVSS 7.8, published 8 Sep 2026)
- [CVE-2026-62810: Microsoft Active Directory Certificate Services heap overflow](https://junglewise.ai/threats/cve-2026-62810-microsoft-active-directory-certificate-services-heap-overflow) (high, CVSS 7.8, published 8 Sep 2026)
- [CVE-2026-56177: Microsoft Windows Server use-after-free privilege escalation](https://junglewise.ai/threats/cve-2026-56177-microsoft-windows-server-use-after-free-privilege-escalation) (high, CVSS 7.8, published 8 Sep 2026)
- [CVE-2026-50362: Microsoft Windows ReFS heap overflow](https://junglewise.ai/threats/cve-2026-50362-microsoft-windows-refs-heap-overflow) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-41089: Microsoft Windows stack-based buffer overflow in Netlogon](https://junglewise.ai/threats/cve-2026-41089-microsoft-windows-stack-based-buffer-overflow-in-netlogon) (critical, CVSS 9.8, published 12 May 2026)
- [CVE-2026-40414: Microsoft Windows TCP/IP null pointer dereference denial of service](https://junglewise.ai/threats/cve-2026-40414-microsoft-windows-tcp-ip-null-pointer-dereference-denial-of) (high, CVSS 7.4, published 12 May 2026)
- [CVE-2026-40413: Microsoft Windows TCP/IP null pointer dereference denial of service](https://junglewise.ai/threats/cve-2026-40413-microsoft-windows-tcp-ip-null-pointer-dereference-denial-of) (high, CVSS 7.4, published 12 May 2026)
- [CVE-2026-40401: Microsoft Windows TCP/IP denial of service via null pointer dereference](https://junglewise.ai/threats/cve-2026-40401-microsoft-windows-tcp-ip-denial-of-service-via-null-pointer) (high, CVSS 7.1, published 12 May 2026)
- [CVE-2026-34351: Microsoft Windows TCP/IP race condition privilege escalation](https://junglewise.ai/threats/cve-2026-34351-microsoft-windows-tcp-ip-race-condition-privilege-escalation) (high, CVSS 7.8, published 12 May 2026)
- [CVE-2026-34330: Microsoft Windows Win32K race condition in GRFX component](https://junglewise.ai/threats/cve-2026-34330-microsoft-windows-win32k-race-condition-in-grfx-component) (high, CVSS 7.8, published 12 May 2026)
- [CVE-2026-25180: Microsoft Graphics Component out-of-bounds read](https://junglewise.ai/threats/cve-2026-25180-microsoft-graphics-component-out-of-bounds-read) (medium, CVSS 5.5, published 10 Mar 2026)
- [CVE-2026-24285: Microsoft Windows Win32K use after free privilege escalation](https://junglewise.ai/threats/cve-2026-24285-microsoft-windows-win32k-use-after-free-privilege-escalation) (high, CVSS 7, published 10 Mar 2026)
- [CVE-2026-21519: Microsoft Windows type confusion in Desktop Window Manager](https://junglewise.ai/threats/cve-2026-21519-microsoft-windows-type-confusion-in-desktop-window-manager) (critical, exploited in the wild, CVSS 7.8, published 10 Feb 2026)
- [CVE-2025-62221: Use after free in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.](https://junglewise.ai/threats/cve-2025-62221-microsoft-windows-use-after-free-in-cloud-files-mini-filter) (critical, exploited in the wild, CVSS 7.8, published 9 Dec 2025)
- [CVE-2025-53799: Microsoft Windows Imaging Component information disclosure](https://junglewise.ai/threats/cve-2025-53799-microsoft-windows-imaging-component-information-disclosure) (medium, CVSS 5.5, published 9 Sep 2025)

## Most severe Microsoft Windows Server vulnerabilities

- [CVE-2026-21519: Microsoft Windows type confusion in Desktop Window Manager](https://junglewise.ai/threats/cve-2026-21519-microsoft-windows-type-confusion-in-desktop-window-manager) (critical, exploited in the wild, CVSS 7.8, published 10 Feb 2026)
- [CVE-2025-62221: Use after free in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.](https://junglewise.ai/threats/cve-2025-62221-microsoft-windows-use-after-free-in-cloud-files-mini-filter) (critical, exploited in the wild, CVSS 7.8, published 9 Dec 2025)
- [CVE-2026-88243: Microsoft Windows DHCP Server out-of-bounds read](https://junglewise.ai/threats/cve-2026-88243-out-of-bounds-read-in-windows-dhcp-server-allows-an-unauthorized) (critical, CVSS 9.8, published 10 Nov 2026)
- [CVE-2026-41089: Microsoft Windows stack-based buffer overflow in Netlogon](https://junglewise.ai/threats/cve-2026-41089-microsoft-windows-stack-based-buffer-overflow-in-netlogon) (critical, CVSS 9.8, published 12 May 2026)
- [CVE-2026-62810: Microsoft Active Directory Certificate Services heap overflow](https://junglewise.ai/threats/cve-2026-62810-microsoft-active-directory-certificate-services-heap-overflow) (high, CVSS 7.8, published 8 Sep 2026)
- [CVE-2026-69821: Microsoft Active Directory Certificate Services privilege escalation](https://junglewise.ai/threats/cve-2026-69821-microsoft-active-directory-certificate-services-privilege) (high, CVSS 7.8, published 8 Sep 2026)
- [CVE-2026-56177: Microsoft Windows Server use-after-free privilege escalation](https://junglewise.ai/threats/cve-2026-56177-microsoft-windows-server-use-after-free-privilege-escalation) (high, CVSS 7.8, published 8 Sep 2026)
- [CVE-2026-34330: Microsoft Windows Win32K race condition in GRFX component](https://junglewise.ai/threats/cve-2026-34330-microsoft-windows-win32k-race-condition-in-grfx-component) (high, CVSS 7.8, published 12 May 2026)
- [CVE-2026-50362: Microsoft Windows ReFS heap overflow](https://junglewise.ai/threats/cve-2026-50362-microsoft-windows-refs-heap-overflow) (high, CVSS 7.8, published 14 Jul 2026)
- [CVE-2026-34351: Microsoft Windows TCP/IP race condition privilege escalation](https://junglewise.ai/threats/cve-2026-34351-microsoft-windows-tcp-ip-race-condition-privilege-escalation) (high, CVSS 7.8, published 12 May 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 | 4 | 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 | 1 | 1 | 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 Server vulnerabilities", https://junglewise.ai/threats/technologies/windows-server, 11 November 2026.