Microsoft · Security update · August 11, 2026
KB5121576: August 2026 security update
KB5121576, released August 11, 2026, fixes 7 CVEs in Microsoft Exchange Server 2016 Cumulative Update 23. None of them is reported as exploited. Patch Radar priority: Urgent.
Urgent
CVEs closed
7
1 rated Critical
Exploited
0
None reported
Exploitation more likely
0
Microsoft's assessment
Highest EPSS
0.0198
80th percentile
Priority of the 7 CVEs
Patch now 0
Urgent 1
High 3
Routine 3
Applies to
CVEs this fix closes
| Priority | CVE | Component | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| Urgent | CVE-2026-62911 | Microsoft Exchange Server | Elevation of Privilege | 8.0 | 0.0069 | Exploitation Less Likely |
| High | CVE-2026-62910 | Microsoft Exchange Server | Elevation of Privilege | 7.2 | 0.0100 | Exploitation Less Likely |
| High | CVE-2026-62913 | Microsoft Exchange Server | Remote Code Execution | 8.8 | 0.0091 | Exploitation Less Likely |
| High | CVE-2026-62914 | Microsoft Exchange Server | Spoofing | 7.3 | 0.0045 | Exploitation Less Likely |
| Routine | CVE-2026-62912 | Microsoft Exchange Server | Denial of Service | 6.5 | 0.0198 | Exploitation Less Likely |
| Routine | CVE-2026-65813 | Microsoft Exchange Server | Elevation of Privilege | 6.5 | 0.0094 | Exploitation Less Likely |
| Routine | CVE-2026-62915 | Microsoft Exchange Server | Security Feature Bypass | 6.5 | 0.0064 | Exploitation Less Likely |
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