Google Chromium PopupBlocker Security Bypass Vulnerability

Are you affected?

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

How to fix CVE-2021-30533

• Recommended remediation

  Apply updates per vendor instructions. CISA due date Jul 18, 2022.

• Official advisories

  • CISA KEV · cisa.gov
  • CVE.org · cve.org
  • FIRST EPSS · first.org
  • NIST NVD · nvd.nist.gov
  • VulnCheck KEV · vulncheck.com

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

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.

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
• VulnCheck 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,

  vulncheck.com

References

• VulnCheck exploitation evidence · blog.confiant.com
• 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
• VulnCheck exploitation evidence · cisa.gov

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.