CVE-2026-66315: Microsoft Edge Chromium

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

Use after free in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.

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.