What’s Vulnerable › Vulnerabilities

CVE-2021-30533: Google Chromium PopupBlocker Security Bypass Vulnerability

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2022-06-27
• EPSS: 16.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-06-07 · updated 2026-06-17
• Weakness: CWE-863

Description

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.

Affected products

• Fedoraproject Fedora: 33, 34
• Google Chrome: before 91.0.4472.77 — fixed in 91.0.4472.77

How to fix

Upgrade to a fixed version: Google Chrome 91.0.4472.77. Check the vendor advisory for mitigations.

References

• https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop_25.html
• https://crbug.com/1145553
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ETMZL6IHCTCTREEL434BQ4THQ7EOHJ43/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAT6EOXVQFE6JFMFQF4IKAOUQSHMHL54/
• https://security.gentoo.org/glsa/202107-06
• https://chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop_25.html
• https://crbug.com/1145553
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ETMZL6IHCTCTREEL434BQ4THQ7EOHJ43/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAT6EOXVQFE6JFMFQF4IKAOUQSHMHL54/
• https://security.gentoo.org/glsa/202107-06
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30533

Get alerted when CVE-2021-30533 or the next vulnerability affects your stack