CVE-2026-66318: Microsoft Edge Chromium

High severity, CVSS 8.1. EPSS: 0.4% chance of exploitation in the next 30 days.

Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to disclose information 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.