CVE-2026-66316: Microsoft Edge Chromium

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

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