Microsoft has 4,599 CVEs on record between 2012 and 2026. Disclosure cadence is accelerating: 2930 in the last 90 days against 932 in the 90 before. The busiest recent month was October 2026 with 1482. The median CVSS is 7.8 (high), with 273 rated critical. 2% have been exploited in the wild, in line with the corpus average. The median gap from publication to a KEV listing is 112 days (95 cases). The dominant weakness classes are CWE-122 (931) and CWE-416 (851). Most affected products: windows_10_1607 (988), Windows 10 Version 1607 (877), 365_apps (267).
CVEs per month
Last 12 months, by publish date
- Exploited share
- 2% vs 1% corpus
- Median CVSS
- 7.8
- Publish → KEV
- 112 d median(95)
- Last 90 days
- 2930 prev 932
Weakness classes
Products
- windows_10_1607 988
- Windows 10 Version 1607 877
- 365_apps 267
- Microsoft 365 Apps for Enterprise 232
- Windows 10 Version 1809 199
- windows_10_1809 174
Worst active — by depth score
CVE-2025-53770Critical· 9.8Deserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized attacker to execute code over a network. Microsoft is aware that an exploit for CVE-2025-53770 exists in the wild. Microsoft is preparing…100CVE-2021-38647Critical· 9.8Open Management Infrastructure (OMI) Remote Code Execution Vulnerability100CVE-2021-34473Critical· 9.1Microsoft Exchange Server Remote Code Execution Vulnerability100CVE-2021-26855Critical· 9.1Microsoft Exchange Server Remote Code Execution Vulnerability100CVE-2020-0796Critical· 10.0A remote code execution vulnerability exists in the way that the Microsoft Server Message Block 3.1.1 (SMBv3) protocol handles certain requests, aka 'Windows SMBv3 Client/Server Remote Code Execution Vulnerability'.100
Microsoft vulnerabilities
CVEs affecting Microsoft, newest first. Open any entry for full detail, references, and exploit status.
4599 CVEsRSS
CVE-2026-24294High· 7.8PoCImproper authentication in Windows SMB Server allows an authorized attacker to elevate privileges locally.
Improper authentication in Windows SMB Server allows an authorized attacker to elevate privileges locally.
CVE-2026-21509High· 7.8CISA KEV0dayPoCReliance on untrusted inputs in a security decision in Microsoft Office allows an unauthorized attacker to bypass a security feature locally.
Reliance on untrusted inputs in a security decision in Microsoft Office allows an unauthorized attacker to bypass a security feature locally.
CVE-2026-20926High· 7.5Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
CVE-2026-20925Medium· 6.5External 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 in Windows NTLM allows an unauthorized attacker to perform spoofing over a network.
CVE-2026-20924High· 7.8Use after free in Windows Management Services allows an authorized attacker to elevate privileges locally.
Use after free in Windows Management Services allows an authorized attacker to elevate privileges locally.
CVE-2026-20923High· 7.8Use after free in Windows Management Services allows an authorized attacker to elevate privileges locally.
Use after free in Windows Management Services allows an authorized attacker to elevate privileges locally.
CVE-2026-20922High· 7.8Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.
Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.
CVE-2026-20921High· 7.5Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
CVE-2026-20920High· 7.8Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.
Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.
CVE-2026-20919High· 7.5Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
CVE-2026-20918High· 7.8Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.
CVE-2026-20877High· 7.8Use after free in Windows Management Services allows an authorized attacker to elevate privileges locally.
Use after free in Windows Management Services allows an authorized attacker to elevate privileges locally.
CVE-2026-20876Medium· 6.7Heap-based buffer overflow in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to elevate privileges locally.
Heap-based buffer overflow in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to elevate privileges locally.
CVE-2026-20875High· 7.5Null pointer dereference in Windows Local Security Authority Subsystem Service (LSASS) allows an unauthorized attacker to deny service over a network.
Null pointer dereference in Windows Local Security Authority Subsystem Service (LSASS) allows an unauthorized attacker to deny service over a network.
CVE-2026-20874High· 7.8Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.
CVE-2026-20873High· 7.8Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.
CVE-2026-20872Medium· 6.5External 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 in Windows NTLM allows an unauthorized attacker to perform spoofing over a network.
CVE-2026-20871High· 7.8Use after free in Desktop Windows Manager allows an authorized attacker to elevate privileges locally.
Use after free in Desktop Windows Manager allows an authorized attacker to elevate privileges locally.
CVE-2026-20870High· 7.8Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.
Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.
CVE-2026-20869High· 7.0Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Local Session Manager (LSM) allows an authorized attacker to elevate privileges locally.
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Local Session Manager (LSM) allows an authorized attacker to elevate privileges locally.
CVE-2026-20868High· 8.8Heap-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 in Windows Routing and Remote Access Service (RRAS) allows an unauthorized attacker to execute code over a network.
CVE-2026-20867High· 7.8Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.
CVE-2026-20866High· 7.8Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.
CVE-2026-20865High· 7.8Use after free in Windows Management Services allows an authorized attacker to elevate privileges locally.
Use after free in Windows Management Services allows an authorized attacker to elevate privileges locally.
CVE-2026-20864High· 7.8Heap-based buffer overflow in Connected Devices Platform Service (Cdpsvc) allows an authorized attacker to elevate privileges locally.
Heap-based buffer overflow in Connected Devices Platform Service (Cdpsvc) allows an authorized attacker to elevate privileges locally.
CVE-2026-20863High· 7.0Double free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.
Double free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.
CVE-2026-20862Medium· 5.5Exposure of sensitive information to an unauthorized actor in Windows Management Services allows an authorized attacker to disclose information locally.
Exposure of sensitive information to an unauthorized actor in Windows Management Services allows an authorized attacker to disclose information locally.
CVE-2026-20861High· 7.8Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.
CVE-2026-20860High· 7.8Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
CVE-2026-20859High· 7.8Use after free in Windows Kernel-Mode Drivers allows an authorized attacker to elevate privileges locally.
Use after free in Windows Kernel-Mode Drivers allows an authorized attacker to elevate privileges locally.