CVE-2026-70309: 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 bypass a security feature over a network.

Affected products

• Microsoft Edge Chromium: before 150.0.4078.65 (fixed in 150.0.4078.65)

Published 2026-08-28. Last modified 2026-08-31.