Microsoft · ServicingStack update · May 12, 2026
KB5087541: May 2026 cumulative update for Windows Server 23H2
KB5087541, released May 12, 2026, fixes 58 CVEs in Windows Server 2022, 23H2 Edition (Server Core installation) (build 25398.2330). None of them is reported as exploited. Patch Radar priority: Urgent. The product is no longer supported.
UrgentUnsupported product
CVEs closed
58
5 rated Critical
Exploited
0
None reported
Exploitation more likely
7
Microsoft's assessment
Highest EPSS
0.7962
99th percentile
Priority of the 58 CVEs
Patch now 0
Urgent 12
High 38
Routine 8
Applies to
| Product | Build after install |
|---|---|
| Windows Server 2022, 23H2 Edition (Server Core installation) | 25398.2330 |
CVEs this fix closes
| Priority | CVE | Component | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| Urgent | CVE-2026-41089 | Windows Netlogon | Remote Code Execution | 9.8 | 0.7962 | Exploitation Less Likely |
| Urgent | CVE-2026-41096 | Microsoft Windows DNS | Remote Code Execution | 9.8 | 0.0270 | Exploitation Unlikely |
| Urgent | CVE-2026-40398 | Windows Remote Desktop | Elevation of Privilege | 7.8 | 0.0267 | More likely |
| Urgent | CVE-2026-33835 | Windows Cloud Files Mini Filter Driver | Elevation of Privilege | 7.8 | 0.0212 | More likely |
| Urgent | CVE-2026-33837 | Windows TCP/IP | Elevation of Privilege | 7.8 | 0.0184 | More likely |
| Urgent | CVE-2026-35416 | Windows Ancillary Function Driver for WinSock | Elevation of Privilege | 7.0 | 0.0165 | More likely |
| Urgent | CVE-2026-35421 | Windows GDI | Remote Code Execution | 7.8 | 0.0053 | Exploitation Unlikely |
| Urgent | CVE-2026-40403 | Windows Win32K - GRFX | Remote Code Execution | 8.8 | 0.0043 | Exploitation Less Likely |
| Urgent | CVE-2026-35417 | Windows Win32K - ICOMP | Elevation of Privilege | 7.8 | 0.0035 | More likely |
| Urgent | CVE-2026-33841 | Windows Kernel | Elevation of Privilege | 7.8 | 0.0031 | More likely |
| Urgent | CVE-2026-32161 | Windows Native WiFi Miniport Driver | Remote Code Execution | 7.5 | 0.0030 | Exploitation Less Likely |
| Urgent | CVE-2026-40397 | Windows Common Log File System Driver | Elevation of Privilege | 7.8 | 0.0027 | More likely |
| High | CVE-2026-35424 | Windows Internet Key Exchange (IKE) Protocol | Denial of Service | 7.5 | 0.0119 | Exploitation Unlikely |
| High | CVE-2026-40406 | Windows TCP/IP | Information Disclosure | 7.5 | 0.0093 | Exploitation Less Likely |
| High | CVE-2026-40415 | Windows TCP/IP | Remote Code Execution | 8.1 | 0.0079 | Exploitation Unlikely |
| High | CVE-2026-40414 | Windows TCP/IP | Denial of Service | 7.4 | 0.0053 | Exploitation Unlikely |
| High | CVE-2026-34329 | Windows Message Queuing | Remote Code Execution | 8.8 | 0.0046 | Exploitation Less Likely |
| High | CVE-2026-40413 | Windows TCP/IP | Denial of Service | 7.4 | 0.0040 | Exploitation Less Likely |
| High | CVE-2026-33838 | Windows Message Queuing | Elevation of Privilege | 7.8 | 0.0040 | Exploitation Less Likely |
| High | CVE-2026-35415 | Windows Storage Spaces Controller | Elevation of Privilege | 7.8 | 0.0033 | Exploitation Less Likely |
| High | CVE-2026-41095 | Data Deduplication | Elevation of Privilege | 7.8 | 0.0033 | Exploitation Less Likely |
| High | CVE-2026-40401 | Windows TCP/IP | Denial of Service | 7.1 | 0.0033 | Exploitation Unlikely |
| High | CVE-2026-40399 | Windows TCP/IP | Elevation of Privilege | 7.8 | 0.0033 | Exploitation Less Likely |
| High | CVE-2026-34343 | Windows Application Identity (AppID) Subsystem | Elevation of Privilege | 7.8 | 0.0033 | Exploitation Less Likely |
| High | CVE-2026-35420 | Windows Kernel | Elevation of Privilege | 7.8 | 0.0032 | Exploitation Less Likely |
Showing 1 to 25 of 58
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