Microsoft · Security update · October 2, 2026
KB5129958: October 2026 security update
KB5129958, released October 2, 2026, fixes 1 CVE in Microsoft Exchange Server 2016 Cumulative Update 23. None of them is reported as exploited. Patch Radar priority: Urgent.
Urgent
CVEs closed
1
None rated Critical
Exploited
0
None reported
Exploitation more likely
1
Vendor assessment
Highest EPSS
0.0275
86th percentile
Applies to
CVEs this fix closes
| Priority | CVE | Component | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| Urgent | CVE-2026-96940 | Microsoft Exchange Server | Elevation of Privilege | 8.8 | 0.0275 | More likely |
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