Microsoft · Security update · May 12, 2026
KB5002863: May 2026 security update
KB5002863, released May 12, 2026, fixes 9 CVEs in Microsoft SharePoint Server Subscription Edition. One of them is being exploited (CVE-2026-45659); 1 on CISA KEV. Patch Radar priority: Patch now.
Patch now1 on CISA KEVKnown ransomware use
CVEs closed
9
2 rated Critical
Exploited
1
CVE-2026-45659
Exploitation more likely
0
Microsoft's assessment
Highest EPSS
0.8024
99th percentile
Priority of the 9 CVEs
Patch now 1
Urgent 2
High 6
Routine 0
Applies to
CVEs this fix closes
| Priority | CVE | Component | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| Patch now | CVE-2026-45659 | Microsoft Office SharePoint | Remote Code Execution | 8.8 | 0.8024 | KEVRansomwareExploited |
| Urgent | CVE-2026-40365 | Microsoft Office SharePoint | Remote Code Execution | 8.8 | 0.0096 | Exploitation Less Likely |
| Urgent | CVE-2026-40367 | Microsoft Office Word | Remote Code Execution | 8.4 | 0.0045 | Exploitation Unlikely |
| High | CVE-2026-33112 | Microsoft Office SharePoint | Remote Code Execution | 8.8 | 0.3112 | Exploitation Less Likely |
| High | CVE-2026-35439 | Microsoft Office SharePoint | Remote Code Execution | 8.8 | 0.0203 | Exploitation Less Likely |
| High | CVE-2026-33110 | Microsoft Office SharePoint | Remote Code Execution | 8.8 | 0.0197 | Exploitation Less Likely |
| High | CVE-2026-40368 | Microsoft Office SharePoint | Remote Code Execution | 8.0 | 0.0182 | Exploitation Less Likely |
| High | CVE-2026-40357 | Microsoft Office SharePoint | Remote Code Execution | 8.8 | 0.0170 | Exploitation Less Likely |
| High | CVE-2026-47294 | Microsoft Office SharePoint | Remote Code Execution | 8.0 | 0.0061 | Exploitation Less Likely |
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