CVE-2026-58529: Microsoft Windows 11 26h1

High severity, CVSS 7.1. EPSS: 1% chance of exploitation in the next 30 days.

Out-of-bounds read in Active Directory Federation Services (AD FS) allows an authorized attacker to disclose information over a network.

Affected products

• Microsoft Windows 11 26h1: before 10.0.28000.2525 (fixed in 10.0.28000.2525)

Published 2026-07-14. Last modified 2026-07-16.