Google Chromium PopupBlocker Security Bypass Vulnerability

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. 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.

2. Jun 27, 2022 · CISA KEV

   Known exploited

   Apply updates per vendor instructions.

3. Jul 18, 2022 · CISA KEV

   Remediation due

   Apply updates per vendor instructions.

4. 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.

Affected

• cpe fedoraproject/fedora33
• cpe fedoraproject/fedora34
• cpe google/chromeversion unspecified
• vendor Google Chromium PopupBlockerversion unspecified

Sources

• CISA KEVConfirmed exploitationCVE-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.orgVulnerability recordCVE-2021-30533

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2021-30533

  30-day exploitation probability 16.7%

  first.org
• NIST NVDVulnerability recordCVE-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

References

• Release Notes · chromereleases.googleblog.com
• Exploit · crbug.com
• Mailing List · lists.fedoraproject.org
• Mailing List · lists.fedoraproject.org
• CISA note · nvd.nist.gov
• Third Party Advisory · security.gentoo.org