CVE-2021-30533
Google Chromium PopupBlocker Security Bypass Vulnerability
Published Jun 7, 2021 · updated Jun 16, 2026 · google chrome
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.
Timeline
Detection, updates, and resolution for this record.
Jun 7, 2021 · Catalog
Detected
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.
Jun 27, 2022 · CISA KEV
Known exploited
Apply updates per vendor instructions.
Jul 18, 2022 · CISA KEV
Remediation due
Apply updates per vendor instructions.
Jun 16, 2026 · Catalog
Updated
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.
Required action
Apply updates per vendor instructions.
CISA due date Jul 18, 2022
Affected
- cpe fedoraproject/fedora33
- cpe fedoraproject/fedora34
- cpe google/chromeversion unspecified
- vendor Google Chromium PopupBlockerversion unspecified
Sources
- CISA KEVCVE-2021-30533
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.
cisa.gov - CVE.orgCVE-2021-30533
Official CVE identifier
cve.org - FIRST EPSSCVE-2021-30533
30-day exploitation probability 16.7%
first.org - NIST NVDCVE-2021-30533
Insufficient policy enforcement in PopupBlocker in Google Chrome prior to 91.0.4472.77 allowed a remote attacker to bypass navigation restrictions via a crafted iframe.
nvd.nist.gov