CISA-confirmed known exploited vulnerability

CVE-2021-30533

Google Chromium PopupBlocker Security Bypass Vulnerability

Google · Chromium PopupBlocker

Vulnerability details

Google Chromium PopupBlocker contains an insufficient policy enforcement vulnerability that allows a remote attacker to bypass navigation restrictions via a crafted iframe. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.

Added to CISA KEV: 2022-06-27

Ransomware campaign use: Unknown

CISA due date: 2022-07-18

Defensive guidance from CISA

Apply updates per vendor instructions.

This is the source's required-action field, not an independently validated patch procedure. Refer to the vendor for exact affected versions and fixes.

Source catalog date: 2026-11-06T19:44:45.1797Z · Last retrieved: 2026-11-06 21:02:26 UTC

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