microsoft has 4,599 CVEs on record between 2012 and 2026. Disclosure cadence is accelerating: 2930 in the last 90 days against 934 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 934
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-2026-83564High· 7.0Use after free in Microsoft Windows Search Component allows an authorized attacker to elevate privileges locally.
Use after free in Microsoft Windows Search Component allows an authorized attacker to elevate privileges locally.
CVE-2026-83523High· 8.8Heap-based buffer overflow in Windows Image Acquisition allows an unauthorized attacker to execute code over a network.
Heap-based buffer overflow in Windows Image Acquisition allows an unauthorized attacker to execute code over a network.
CVE-2026-83522High· 8.1Reliance on untrusted inputs in a security decision in Windows IKE Extension allows an unauthorized attacker to perform spoofing over a network.
Reliance on untrusted inputs in a security decision in Windows IKE Extension allows an unauthorized attacker to perform spoofing over a network.
CVE-2026-83521Medium· 6.5Out-of-bounds read in Windows IKE Extension allows an authorized attacker to disclose information over a network.
Out-of-bounds read in Windows IKE Extension allows an authorized attacker to disclose information over a network.
CVE-2026-83520High· 8.8Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.
Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.
CVE-2026-83519Critical· 9.8Heap-based buffer overflow in Windows Error Reporting allows an unauthorized attacker to execute code over a network.
Heap-based buffer overflow in Windows Error Reporting allows an unauthorized attacker to execute code over a network.
CVE-2026-83518High· 7.8Heap-based buffer overflow in RPC Runtime allows an authorized attacker to elevate privileges locally.
Heap-based buffer overflow in RPC Runtime allows an authorized attacker to elevate privileges locally.
CVE-2026-83517Critical· 9.8Heap-based buffer overflow in Microsoft Windows Media Foundation allows an unauthorized attacker to execute code over a network.
Heap-based buffer overflow in Microsoft Windows Media Foundation allows an unauthorized attacker to execute code over a network.
CVE-2026-83516High· 7.5Out-of-bounds read in Windows Local Security Authority Subsystem Service (LSASS) allows an unauthorized attacker to deny service over a network.
Out-of-bounds read in Windows Local Security Authority Subsystem Service (LSASS) allows an unauthorized attacker to deny service over a network.
CVE-2026-83515Medium· 6.5Use of uninitialized resource in RPC Runtime allows an unauthorized attacker to disclose information over a network.
Use of uninitialized resource in RPC Runtime allows an unauthorized attacker to disclose information over a network.
CVE-2026-83514High· 7.8Heap-based buffer overflow in Windows Partition Management Driver allows an authorized attacker to elevate privileges locally.
Heap-based buffer overflow in Windows Partition Management Driver allows an authorized attacker to elevate privileges locally.
CVE-2026-83513High· 7.8Use after free in Windows Universal Disk Format File System Driver (UDFS) allows an authorized attacker to elevate privileges locally.
Use after free in Windows Universal Disk Format File System Driver (UDFS) allows an authorized attacker to elevate privileges locally.
CVE-2026-83511High· 7.4Weak authentication in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.
Weak authentication in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.
CVE-2026-83510High· 7.0Time-of-check time-of-use (toctou) race condition in Windows Setup Files Cleanup allows an authorized attacker to elevate privileges locally.
Time-of-check time-of-use (toctou) race condition in Windows Setup Files Cleanup allows an authorized attacker to elevate privileges locally.
CVE-2026-83509High· 7.0Untrusted search path in Windows Setup Files Cleanup allows an authorized attacker to elevate privileges locally.
Untrusted search path in Windows Setup Files Cleanup allows an authorized attacker to elevate privileges locally.
CVE-2026-83508High· 7.8Out-of-bounds read in Windows NTFS allows an authorized attacker to elevate privileges locally.
Out-of-bounds read in Windows NTFS allows an authorized attacker to elevate privileges locally.
CVE-2026-83507Medium· 5.5Improper link resolution before file access ('link following') in Windows Update Orchestrator Service allows an authorized attacker to disclose information locally.
Improper link resolution before file access ('link following') in Windows Update Orchestrator Service allows an authorized attacker to disclose information locally.
CVE-2026-83506High· 7.8Untrusted search path in Servicing Stack Updates allows an authorized attacker to elevate privileges locally.
Untrusted search path in Servicing Stack Updates allows an authorized attacker to elevate privileges locally.
CVE-2026-83505High· 7.0Time-of-check time-of-use (toctou) race condition in Windows Setup Files Cleanup allows an authorized attacker to elevate privileges locally.
Time-of-check time-of-use (toctou) race condition in Windows Setup Files Cleanup allows an authorized attacker to elevate privileges locally.
CVE-2026-83504Medium· 4.7Time-of-check time-of-use (toctou) race condition in Windows SmartScreen allows an authorized attacker to disclose information locally.
Time-of-check time-of-use (toctou) race condition in Windows SmartScreen allows an authorized attacker to disclose information locally.
CVE-2026-83500Medium· 6.1Url redirection to untrusted site ('open redirect') in Windows BitLocker allows an unauthorized attacker to bypass a security feature with a physical attack.
Url redirection to untrusted site ('open redirect') in Windows BitLocker allows an unauthorized attacker to bypass a security feature with a physical attack.
CVE-2026-83499High· 7.8Insufficient granularity of access control in Windows Server Update Service allows an authorized attacker to elevate privileges locally.
Insufficient granularity of access control in Windows Server Update Service allows an authorized attacker to elevate privileges locally.
CVE-2026-81971High· 7.0Concurrent execution using shared resource with improper synchronization ('race condition') in Windows NTFS allows an authorized attacker to elevate privileges locally.
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows NTFS allows an authorized attacker to elevate privileges locally.
CVE-2026-81969High· 7.8Insufficient granularity of access control in Windows Server Update Service allows an authorized attacker to elevate privileges locally.
Insufficient granularity of access control in Windows Server Update Service allows an authorized attacker to elevate privileges locally.
CVE-2026-81964Medium· 5.5Use of hard-coded credentials in Windows Update Orchestrator Service allows an authorized attacker to bypass a security feature locally.
Use of hard-coded credentials in Windows Update Orchestrator Service allows an authorized attacker to bypass a security feature locally.
CVE-2026-78459High· 7.8Heap-based buffer overflow in Windows Internet Information Services allows an authorized attacker to elevate privileges locally.
Heap-based buffer overflow in Windows Internet Information Services allows an authorized attacker to elevate privileges locally.
CVE-2026-77910High· 8.8Incorrect authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Incorrect authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
CVE-2026-77902High· 8.8Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
CVE-2026-77496High· 8.8Heap-based buffer overflow in Windows Imaging Component allows an unauthorized attacker to execute code over a network.
Heap-based buffer overflow in Windows Imaging Component allows an unauthorized attacker to execute code over a network.
CVE-2026-73027High· 7.8External control of system or configuration setting in Windows Setup Files Cleanup allows an authorized attacker to elevate privileges locally.
External control of system or configuration setting in Windows Setup Files Cleanup allows an authorized attacker to elevate privileges locally.