Google Chromium PopupBlocker Security Bypass Vulnerability

MEDIUM 6.5EXPLOITED (CISA KEV)CVE-2021-30533 · Published 07/06/2021 · updated 17/06/2026

Google Chromium PopupBlocker Security Bypass Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 27/06/2022. Patch affected systems as an emergency.

In short

CVE-2021-30533 is a MEDIUM (CVSS 6.5) vulnerability affecting chrome (google).
Exploited in the wild: CISA added it to the KEV catalog on 27/06/2022.
Chance of exploitation in the next 30 days (EPSS): 16.7%, higher than 97.0% of all vulnerabilities.
Fix: update to 91.0.4472.77 or later.

Package	Affected versions	Patched versions
chrome google	`< 91.0.4472.77`	`91.0.4472.77`

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.

References

chromereleases.googleblog.com/2021/05/stable-channel-update-for-desktop_25.html · Release Notes
crbug.com/1145553 · Exploit
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ETMZL6IHCTCTREEL434BQ4THQ7EOHJ43 · Mailing List
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAT6EOXVQFE6JFMFQF4IKAOUQSHMHL54 · Mailing List
security.gentoo.org/glsa/202107-06 · Third Party Advisory
cisa.gov/known-exploited-vulnerabilities-catalog · US Government Resource
CISA KEV · CVE-2021-30533

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Package

Affected versions

Patched versions

chrome

google

< 91.0.4472.77

91.0.4472.77

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