CVE-2026-83516: Microsoft Windows 10 Version 1809

High severity, CVSS 7.5. EPSS: 1.2% chance of exploitation in the next 30 days.

Out-of-bounds read in Windows Local Security Authority Subsystem Service (LSASS) allows an unauthorized attacker to deny service over a network.

Affected products

• Microsoft Windows 10 Version 1809: from 10.0.17763.0, before 10.0.17763.9376 (fixed in 10.0.17763.9376)
• Microsoft Windows 11 Version 24h2: from 10.0.26100.0, before 10.0.26100.9711 (fixed in 10.0.26100.9711)
• Microsoft Windows 11 Version 25h2: from 10.0.26200.0, before 10.0.26200.9711 (fixed in 10.0.26200.9711)
• Microsoft Windows 11 Version 26h1: from 10.0.28000.0, before 10.0.28000.3231 (fixed in 10.0.28000.3231)
• Microsoft Windows 11 Version 26h2: from 10.0.26300.0, before 10.0.26300.9711 (fixed in 10.0.26300.9711)
• Microsoft Windows Server 2019: from 10.0.17763.0, before 10.0.17763.9376 (fixed in 10.0.17763.9376)
• Microsoft Windows Server 2019 Server Core Installation: from 10.0.17763.0, before 10.0.17763.9376 (fixed in 10.0.17763.9376)
• Microsoft Windows Server 2022: from 10.0.20348.0, before 10.0.20348.5761 (fixed in 10.0.20348.5761)
• Microsoft Windows Server 2025: from 10.0.26100.0, before 10.0.26100.33650 (fixed in 10.0.26100.33650)
• Microsoft Windows Server 2025 Server Core Installation: from 10.0.26100.0, before 10.0.26100.33650 (fixed in 10.0.26100.33650)

Published 2026-10-13. Last modified 2026-10-13.