CVE-2026-66311: Microsoft Edge Chromium

Medium severity, CVSS 6.2. EPSS: 0.4% chance of exploitation in the next 30 days.

Missing authorization in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform tampering locally.

Affected products

• Microsoft Edge Chromium: before 151.0.4129.59 (fixed in 151.0.4129.59)

Published 2026-08-04. Last modified 2026-08-06.