Microsoft · Security update · August 11, 2026
KB5123303: August 2026 security update
KB5123303, released August 11, 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
0.0033
26th percentile
Priority of the 3 CVEs
Patch now 0
Urgent 1
High 1
Routine 1
Applies to
CVEs this fix closes
| Priority | CVE | Component | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| Urgent | CVE-2026-66799 | Windows Key Guard | Elevation of Privilege | 7.8 | 0.0033 | Exploitation Less Likely |
| High | CVE-2026-6726 | Windows TPM | Spoofing | 7.9 | 0.0019 | Exploitation Less Likely |
| Routine | CVE-2026-6727 | Windows TPM | Information Disclosure | 5.9 | 0.0015 | Exploitation Less Likely |
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