CVE-2026-66314: Microsoft Edge Chromium

Medium severity, CVSS 5.3. EPSS: 0.6% chance of exploitation in the next 30 days.

Time-of-check time-of-use (toctou) race condition 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.