Microsoft · Security update · May 12, 2026
KB5002858: May 2026 security update
KB5002858, released May 12, 2026, fixes 6 CVEs across 2 products. None of them is reported as exploited. Patch Radar priority: Urgent. The product is no longer supported.
UrgentUnsupported product
CVEs closed
6
4 rated Critical
Exploited
0
None reported
Exploitation more likely
2
Microsoft's assessment
Highest EPSS
0.0442
91st percentile
Priority of the 6 CVEs
Patch now 0
Urgent 4
High 0
Routine 2
Applies to
CVEs this fix closes
| Priority | CVE | Component | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| Urgent | CVE-2026-40364 | Microsoft Office Word | Remote Code Execution | 8.4 | 0.0442 | More likely |
| Urgent | CVE-2026-40361 | Microsoft Office | Remote Code Execution | 8.4 | 0.0061 | More likely |
| Urgent | CVE-2026-40367 | Microsoft Office Word | Remote Code Execution | 8.4 | 0.0045 | Exploitation Unlikely |
| Urgent | CVE-2026-40366 | Microsoft Office Word | Remote Code Execution | 8.4 | 0.0038 | Exploitation Less Likely |
| Routine | CVE-2026-40421 | Microsoft Office Word | Information Disclosure | 4.3 | 0.0062 | Exploitation Less Likely |
| Routine | CVE-2026-35440 | Microsoft Office Word | Information Disclosure | 5.5 | 0.0045 | Exploitation Less Likely |
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