Microsoft · Security update · May 12, 2026
KB5002866: May 2026 security update
KB5002866, released May 12, 2026, fixes 2 CVEs across 2 products. None of them is reported as exploited. Patch Radar priority: Urgent.
Urgent
CVEs closed
2
2 rated Critical
Exploited
0
None reported
Exploitation more likely
0
Vendor assessment
Highest EPSS
0.0038
32nd percentile
Priority of the 2 CVEs
Patch now 0
Urgent 2
High 0
Routine 0
Applies to
CVEs this fix closes
| Priority | CVE | Component | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| Urgent | CVE-2026-40363 | Microsoft Office | Remote Code Execution | 8.4 | 0.0038 | Exploitation Less Likely |
| Urgent | CVE-2026-40358 | Microsoft Office | Remote Code Execution | 8.4 | 0.0037 | Exploitation Less Likely |
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