Microsoft Windows Server 23h2
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By the Year
In 2026 there have been 77 vulnerabilities in Microsoft Windows Server 23h2 with an average score of 6.9 out of ten. Last year, in 2025 Windows Server 23h2 had 375 security vulnerabilities published. If vulnerabilities keep coming in at the current rate, it appears that number of security vulnerabilities in Windows Server 23h2 in 2026 could surpass last years number. Last year, the average CVE base score was greater by 0.27
| Year | Vulnerabilities | Average Score |
|---|---|---|
| 2026 | 77 | 6.94 |
| 2025 | 375 | 7.20 |
| 2024 | 128 | 7.50 |
| 2023 | 29 | 7.66 |
It may take a day or so for new Windows Server 23h2 vulnerabilities to show up in the stats or in the list of recent security vulnerabilities. Additionally vulnerabilities may be tagged under a different product or component name.
Recent Microsoft Windows Server 23h2 Security Vulnerabilities
Jan 2026: Windows File Explorer Information Disclosure Vulnerability
CVE-2026-20939
5.5 - Medium
- January 13, 2026
Exposure of sensitive information to an unauthorized actor in Windows File Explorer allows an authorized attacker to disclose information locally.
Information Disclosure
Jan 2026: Windows File Explorer Information Disclosure Vulnerability
CVE-2026-20937
5.5 - Medium
- January 13, 2026
Exposure of sensitive information to an unauthorized actor in Windows File Explorer allows an authorized attacker to disclose information locally.
Information Disclosure
Jan 2026: Windows NDIS Information Disclosure Vulnerability
CVE-2026-20936
4.3 - Medium
- January 13, 2026
Out-of-bounds read in Windows NDIS allows an authorized attacker to disclose information with a physical attack.
Out-of-bounds Read
Jan 2026: Windows Telephony Service Elevation of Privilege Vulnerability
CVE-2026-20931
8 - High
- January 13, 2026
External control of file name or path in Windows Telephony Service allows an authorized attacker to elevate privileges over an adjacent network.
External Control of File Name or Path
Jan 2026: Windows HTTP.sys Elevation of Privilege Vulnerability
CVE-2026-20929
7.5 - High
- January 13, 2026
Improper access control in Windows HTTP.sys allows an authorized attacker to elevate privileges over a network.
Authorization
Jan 2026: Windows Management Services Elevation of Privilege Vulnerability
CVE-2026-20874
7.8 - High
- January 13, 2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.
Race Condition
Jan 2026: Windows Management Services Elevation of Privilege Vulnerability
CVE-2026-20873
7.8 - High
- January 13, 2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.
Race Condition
Jan 2026: NTLM Hash Disclosure Spoofing Vulnerability
CVE-2026-20872
6.5 - Medium
- January 13, 2026
External control of file name or path in Windows NTLM allows an unauthorized attacker to perform spoofing over a network.
External Control of File Name or Path
Jan 2026: Desktop Windows Manager Elevation of Privilege Vulnerability
CVE-2026-20871
7.8 - High
- January 13, 2026
Use after free in Desktop Windows Manager allows an authorized attacker to elevate privileges locally.
Dangling pointer
Jan 2026: Windows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability
CVE-2026-20868
8.8 - High
- January 13, 2026
Heap-based buffer overflow in Windows Routing and Remote Access Service (RRAS) allows an unauthorized attacker to execute code over a network.
Heap-based Buffer Overflow
Jan 2026: Windows Management Services Elevation of Privilege Vulnerability
CVE-2026-20867
7.8 - High
- January 13, 2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.
Race Condition
Jan 2026: Windows Management Services Elevation of Privilege Vulnerability
CVE-2026-20866
7.8 - High
- January 13, 2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.
Race Condition
Jan 2026: Windows Management Services Information Disclosure Vulnerability
CVE-2026-20862
5.5 - Medium
- January 13, 2026
Exposure of sensitive information to an unauthorized actor in Windows Management Services allows an authorized attacker to disclose information locally.
Information Disclosure
Jan 2026: Win32k Elevation of Privilege Vulnerability
CVE-2026-20863
7 - High
- January 13, 2026
Double free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.
Double-free
Jan 2026: Windows Management Services Elevation of Privilege Vulnerability
CVE-2026-20861
7.8 - High
- January 13, 2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.
Race Condition
Jan 2026: Windows Kerberos Elevation of Privilege Vulnerability
CVE-2026-20849
7.5 - High
- January 13, 2026
Reliance on untrusted inputs in a security decision in Windows Kerberos allows an authorized attacker to elevate privileges over a network.
Reliance on Untrusted Inputs in a Security Decision
Jan 2026: Windows SMB Server Elevation of Privilege Vulnerability
CVE-2026-20848
7.5 - High
- January 13, 2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
Race Condition
Jan 2026: Windows Routing and Remote Access Service (RRAS) Elevation of Privilege Vulnerability
CVE-2026-20843
7.8 - High
- January 13, 2026
Improper access control in Windows Routing and Remote Access Service (RRAS) allows an authorized attacker to elevate privileges locally.
Authorization
Jan 2026: Windows SMB Server Elevation of Privilege Vulnerability
CVE-2026-20934
7.5 - High
- January 13, 2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
Race Condition
Jan 2026: Windows SMB Server Denial of Service Vulnerability
CVE-2026-20927
5.3 - Medium
- January 13, 2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to deny service over a network.
Race Condition
Jan 2026: Windows File Explorer Information Disclosure Vulnerability
CVE-2026-20932
5.5 - Medium
- January 13, 2026
Exposure of sensitive information to an unauthorized actor in Windows File Explorer allows an authorized attacker to disclose information locally.
Information Disclosure
Jan 2026: NTLM Hash Disclosure Spoofing Vulnerability
CVE-2026-20925
6.5 - Medium
- January 13, 2026
External control of file name or path in Windows NTLM allows an unauthorized attacker to perform spoofing over a network.
External Control of File Name or Path
Jan 2026: Windows SMB Server Elevation of Privilege Vulnerability
CVE-2026-20926
7.5 - High
- January 13, 2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
Race Condition
Jan 2026: Windows Management Services Elevation of Privilege Vulnerability
CVE-2026-20923
7.8 - High
- January 13, 2026
Use after free in Windows Management Services allows an authorized attacker to elevate privileges locally.
Dangling pointer
Jan 2026: Windows Management Services Elevation of Privilege Vulnerability
CVE-2026-20924
7.8 - High
- January 13, 2026
Use after free in Windows Management Services allows an authorized attacker to elevate privileges locally.
Dangling pointer
Jan 2026: Windows NTFS Remote Code Execution Vulnerability
CVE-2026-20922
7.8 - High
- January 13, 2026
Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.
Heap-based Buffer Overflow
Jan 2026: Win32k Elevation of Privilege Vulnerability
CVE-2026-20920
7.8 - High
- January 13, 2026
Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.
Dangling pointer
Jan 2026: Windows SMB Server Elevation of Privilege Vulnerability
CVE-2026-20921
7.5 - High
- January 13, 2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
Race Condition
Jan 2026: Windows SMB Server Elevation of Privilege Vulnerability
CVE-2026-20919
7.5 - High
- January 13, 2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
Race Condition
Jan 2026: Windows Management Services Elevation of Privilege Vulnerability
CVE-2026-20918
7.8 - High
- January 13, 2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.
Race Condition
Jan 2026: Windows Management Services Elevation of Privilege Vulnerability
CVE-2026-20877
7.8 - High
- January 13, 2026
Use after free in Windows Management Services allows an authorized attacker to elevate privileges locally.
Dangling pointer
Jan 2026: Windows Local Security Authority Subsystem Service (LSASS) Denial of Service Vulnerability
CVE-2026-20875
7.5 - High
- January 13, 2026
Null pointer dereference in Windows Local Security Authority Subsystem Service (LSASS) allows an unauthorized attacker to deny service over a network.
NULL Pointer Dereference
Jan 2026: Windows Virtualization-Based Security (VBS) Enclave Elevation of Privilege Vulnerability
CVE-2026-20876
6.7 - Medium
- January 13, 2026
Heap-based buffer overflow in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to elevate privileges locally.
Heap-based Buffer Overflow
Jan 2026: Windows Local Session Manager (LSM) Elevation of Privilege Vulnerability
CVE-2026-20869
7 - High
- January 13, 2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Local Session Manager (LSM) allows an authorized attacker to elevate privileges locally.
Race Condition
Jan 2026: Windows Connected Devices Platform Service Elevation of Privilege Vulnerability
CVE-2026-20864
7.8 - High
- January 13, 2026
Heap-based buffer overflow in Connected Devices Platform Service (Cdpsvc) allows an authorized attacker to elevate privileges locally.
Heap-based Buffer Overflow
Jan 2026: Windows Management Services Elevation of Privilege Vulnerability
CVE-2026-20865
7.8 - High
- January 13, 2026
Use after free in Windows Management Services allows an authorized attacker to elevate privileges locally.
Dangling pointer
Jan 2026: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
CVE-2026-20860
7.8 - High
- January 13, 2026
Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Object Type Confusion
Jan 2026: Windows Management Services Elevation of Privilege Vulnerability
CVE-2026-20858
7.8 - High
- January 13, 2026
Use after free in Windows Management Services allows an authorized attacker to elevate privileges locally.
Dangling pointer
Jan 2026: Windows Server Update Service (WSUS) Remote Code Execution Vulnerability
CVE-2026-20856
8.1 - High
- January 13, 2026
Improper input validation in Windows Server Update Service allows an unauthorized attacker to execute code over a network.
Improper Input Validation
Jan 2026: Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
CVE-2026-20857
7.8 - High
- January 13, 2026
Untrusted pointer dereference in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.
Untrusted Pointer Dereference
Jan 2026: Windows Hello Tampering Vulnerability
CVE-2026-20852
7.7 - High
- January 13, 2026
Incorrect privilege assignment in Windows Hello allows an unauthorized attacker to perform tampering locally.
Incorrect Privilege Assignment
Jan 2026: Microsoft Windows File Explorer Spoofing Vulnerability
CVE-2026-20847
6.5 - Medium
- January 13, 2026
Exposure of sensitive information to an unauthorized actor in Windows Shell allows an authorized attacker to perform spoofing over a network.
Information Disclosure
Jan 2026: Microsoft DWM Core Library Elevation of Privilege Vulnerability
CVE-2026-20842
7 - High
- January 13, 2026
Use after free in Windows DWM allows an authorized attacker to elevate privileges locally.
Dangling pointer
Jan 2026: Windows Clipboard Server Elevation of Privilege Vulnerability
CVE-2026-20844
7.4 - High
- January 13, 2026
Use after free in Windows Clipboard Server allows an unauthorized attacker to elevate privileges locally.
Dangling pointer
Jan 2026: Windows Client-Side Caching (CSC) Service Information Disclosure Vulnerability
CVE-2026-20839
5.5 - Medium
- January 13, 2026
Improper access control in Windows Client-Side Caching (CSC) Service allows an authorized attacker to disclose information locally.
Authorization
Jan 2026: Windows NTFS Remote Code Execution Vulnerability
CVE-2026-20840
7.8 - High
- January 13, 2026
Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.
Heap-based Buffer Overflow
Jan 2026: Windows Kernel Information Disclosure Vulnerability
CVE-2026-20838
5.5 - Medium
- January 13, 2026
Generation of error message containing sensitive information in Windows Kernel allows an authorized attacker to disclose information locally.
Generation of Error Message Containing Sensitive Information
Jan 2026: Windows Media Remote Code Execution Vulnerability
CVE-2026-20837
7.8 - High
- January 13, 2026
Heap-based buffer overflow in Windows Media allows an unauthorized attacker to execute code locally.
Heap-based Buffer Overflow
Jan 2026: DirectX Graphics Kernel Elevation of Privilege Vulnerability
CVE-2026-20836
7 - High
- January 13, 2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Graphics Kernel allows an authorized attacker to elevate privileges locally.
Race Condition
Jan 2026: Windows Spoofing Vulnerability
CVE-2026-20834
4.6 - Medium
- January 13, 2026
Absolute path traversal in Windows Shell allows an unauthorized attacker to perform spoofing with a physical attack.
Absolute Path Traversal
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