CVE-2025-9866: Google Chrome

High severity, CVSS 8.8. EPSS: 0.4% chance of exploitation in the next 30 days.

Inappropriate implementation in Extensions in Google Chrome prior to 140.0.7339.80 allowed a remote attacker to bypass content security policy via a crafted HTML page. (Chromium security severity: Medium)

Affected products

• Google Chrome: before 140.0.7339.80 (fixed in 140.0.7339.80)

Published 2025-09-03. Last modified 2026-09-26.