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

criticalknown exploitedCVE-2021-30533
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: Googleproduct: ChromiumAuthentication bypass
What
Google Chromium PopupBlocker contains an insufficient policy enforcement vulnerability that allows a remote attacker to bypass navigation restrictions via a crafted iframe.
Who is affected
Users of web browsers utilizing Chromium, including Google Chrome, Microsoft Edge, and Opera.
Urgency
Remediation is critical due to confirmed exploitation and high severity.
Action
Update to the latest version of Chromium-based browsers.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2022-06-27
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-30533

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-30533coverage & exploitation statusNVD · CVE.org

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