CVE-2025-59509: Microsoft Windows 10 1809

Medium severity, CVSS 5.5. EPSS: 0.6% chance of exploitation in the next 30 days.

Insertion of sensitive information into sent data in Windows Speech allows an authorized attacker to disclose information locally.

Affected products

• Microsoft Windows 10 1809: before 10.0.17763.8027 (fixed in 10.0.17763.8027)
• Microsoft Windows 10 21h2: before 10.0.19044.6575 (fixed in 10.0.19044.6575)
• Microsoft Windows 10 22h2: before 10.0.19045.6575 (fixed in 10.0.19045.6575)
• Microsoft Windows 11 23h2: before 10.0.22631.6199 (fixed in 10.0.22631.6199)
• Microsoft Windows 11 24h2: before 10.0.26100.7092 (fixed in 10.0.26100.7092)
• Microsoft Windows 11 25h2: before 10.0.26200.7092 (fixed in 10.0.26200.7092)
• Microsoft Windows Server 2019: before 10.0.17763.8027 (fixed in 10.0.17763.8027)
• Microsoft Windows Server 2022: before 10.0.20348.4346 (fixed in 10.0.20348.4346)
• Microsoft Windows Server 2022 23h2: before 10.0.25398.1965 (fixed in 10.0.25398.1965)
• Microsoft Windows Server 2025: before 10.0.26100.7092 (fixed in 10.0.26100.7092)

Published 2025-11-11. Last modified 2026-06-17.