CVE-2026-66312: Microsoft Edge Chromium

High severity, CVSS 8.8. EPSS: 1.1% chance of exploitation in the next 30 days.

Buffer over-read in Microsoft Edge (Chromium-based) allows an authorized 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.