CVE-2026-61359: Microsoft Windows 11 23h2

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

Heap-based buffer overflow in Windows Storage allows an authorized attacker to elevate privileges locally.

Affected products

• Microsoft Windows 11 23h2: before 10.0.22631.7517 (fixed in 10.0.22631.7517)
• Microsoft Windows 11 24h2: before 10.0.26100.9106 (fixed in 10.0.26100.9106)
• Microsoft Windows 11 25h2: before 10.0.26200.9106 (fixed in 10.0.26200.9106)
• Microsoft Windows 11 26h1: before 10.0.28000.2704 (fixed in 10.0.28000.2704)
• Microsoft Windows Server 2022: before 10.0.20348.5440 (fixed in 10.0.20348.5440)
• Microsoft Windows Server 2025: before 10.0.26100.33222 (fixed in 10.0.26100.33222)

Published 2026-08-11. Last modified 2026-08-13.