Microsoft · Security update · January 13, 2026
KB5002831: January 2026 security update
KB5002831, released January 13, 2026, fixes 3 CVEs across 2 products. None of them is reported as exploited. Patch Radar priority: Urgent.
Urgent
CVEs closed
3
1 rated Critical
Exploited
0
None reported
Exploitation more likely
0
Vendor assessment
Highest EPSS
0.0065
51st percentile
Priority of the 3 CVEs
Patch now 0
Urgent 1
High 2
Routine 0
Applies to
CVEs this fix closes
| Priority | CVE | Component | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| Urgent | CVE-2026-20957 | Microsoft Office Excel | Remote Code Execution | 7.8 | 0.0051 | Exploitation Less Likely |
| High | CVE-2026-20946 | Microsoft Office Excel | Remote Code Execution | 7.8 | 0.0065 | Exploitation Less Likely |
| High | CVE-2026-20950 | Microsoft Office Excel | Remote Code Execution | 7.8 | 0.0049 | Exploitation Less Likely |
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