CVE-2021-21126: Google Chrome

Medium severity, CVSS 6.5. EPSS: 8.7% chance of exploitation in the next 30 days.

Insufficient policy enforcement in extensions in Google Chrome prior to 88.0.4324.96 allowed a remote attacker to bypass site isolation via a crafted Chrome Extension.

Affected products

• Google Chrome: before 88.0.4324.96 (fixed in 88.0.4324.96)
• Microsoft Edge Chromium: before 88.0.705.50 (fixed in 88.0.705.50)

Published 2021-02-09. Last modified 2026-06-17.