Microsoft · Security update · February 10, 2026

KB5075904: February 2026 cumulative update for Windows 10 1809

KB5075904, released February 10, 2026, fixes 24 CVEs across 4 products. 5 of them are being exploited (CVE-2026-21510); 5 on CISA KEV. Patch Radar priority: Patch now.

Patch now5 on CISA KEV2 publicly disclosed
CVEs closed
24
None rated Critical
Exploited
5
CVE-2026-21510
Exploitation more likely
3
Vendor assessment
Highest EPSS
0.6124
99th percentile

Priority of the 24 CVEs

Patch now 5 Urgent 3 High 14 Routine 2

Applies to

ProductBuild after install
Windows 10 Version 1809 for 32-bit Systems17763.8389
Windows 10 Version 1809 for x64-based Systems17763.8389
Windows Server 201917763.8389
Windows Server 2019 (Server Core installation)17763.8389

CVEs this fix closes

PriorityCVEComponentImpactCVSSEPSSExploitation
Patch now CVE-2026-21510 Windows Shell Security Feature Bypass 8.8 0.6124 KEVDisclosedExploited
Patch now CVE-2026-21513 MSHTML Framework Security Feature Bypass 8.8 0.1585 KEVDisclosedExploited
Patch now CVE-2026-21525 Windows Remote Access Connection Manager Denial of Service 6.2 0.0504 KEVExploited
Patch now CVE-2026-21533 Windows Remote Desktop Elevation of Privilege 7.8 0.0434 KEVExploited
Patch now CVE-2026-21519 Desktop Window Manager Elevation of Privilege 7.8 0.0257 KEVExploited
Urgent CVE-2026-21238 Windows Ancillary Function Driver for WinSock Elevation of Privilege 7.8 0.0333 More likely
Urgent CVE-2026-21231 Windows Kernel Elevation of Privilege 7.8 0.0252 More likely
Urgent CVE-2026-21253 Mailslot File System Elevation of Privilege 7.0 0.0079 More likely
High CVE-2026-20846 Windows GDI+ Denial of Service 7.5 0.0141 Exploitation Less Likely
High CVE-2026-21243 Windows LDAP - Lightweight Directory Access Protocol Denial of Service 7.5 0.0141 Exploitation Unlikely
High CVE-2026-21244 Role: Windows Hyper-V Remote Code Execution 7.3 0.0131 Exploitation Less Likely
High CVE-2026-21248 Role: Windows Hyper-V Remote Code Execution 7.3 0.0131 Exploitation Less Likely
High CVE-2026-21235 Microsoft Graphics Component Elevation of Privilege 7.3 0.0073 Exploitation Less Likely
High CVE-2026-21247 Role: Windows Hyper-V Remote Code Execution 7.3 0.0058 Exploitation Less Likely
High CVE-2026-21508 Windows Storage Elevation of Privilege 7.0 0.0044 Exploitation Less Likely
High CVE-2026-21236 Windows Ancillary Function Driver for WinSock Elevation of Privilege 7.8 0.0044 Exploitation Unlikely
High CVE-2026-21239 Windows Kernel Elevation of Privilege 7.8 0.0044 Exploitation Less Likely
High CVE-2026-21246 Microsoft Graphics Component Elevation of Privilege 7.8 0.0044 Exploitation Unlikely
High CVE-2026-21251 Windows Cluster Client Failover Elevation of Privilege 7.8 0.0044 Exploitation Unlikely
High CVE-2026-21255 Role: Windows Hyper-V Security Feature Bypass 8.8 0.0038 Exploitation Less Likely
High CVE-2026-21240 Windows HTTP.sys Elevation of Privilege 7.8 0.0028 Exploitation Less Likely
High CVE-2026-21234 Windows Connected Devices Platform Service Elevation of Privilege 7.0 0.0027 Exploitation Unlikely
Routine CVE-2026-21249 Windows NTLM Spoofing 3.3 0.1128 Exploitation Less Likely
Routine CVE-2026-21222 Windows Kernel Information Disclosure 5.5 0.0060 Exploitation Less Likely
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