CVE & CISA-KEV Catalog

CVE-2021-30533

MEDIUMCISA KEVEPSS 97th pctl

6.5

CVSS v3

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.

CWE-863Incorrect Authorization

How to fix

Remediation Available

chromiumDebian

Fixed in:93.0.4577.82-1CVE-2021-30533

Fixed in:93.0.4577.82-1CVE-2021-30533

Fixed in:93.0.4577.82-1CVE-2021-30533

Fixed in:93.0.4577.82-1CVE-2021-30533

Google ChromeWindows application

Affected:91.0.4472.77Fixed in:91.0.4472.77Google LLC

Google Chrome (EXE)Windows application

Affected:91.0.4472.77Fixed in:91.0.4472.77Google LLC

Google Chrome BetaWindows application

Affected:91.0.4472.77Fixed in:91.0.4472.77Google LLC

Google Chrome Beta (EXE)Windows application

Affected:91.0.4472.77Fixed in:91.0.4472.77Google LLC

Google Chrome CanaryWindows application

Affected:91.0.4472.77Fixed in:91.0.4472.77Google LLC

Google Chrome DevWindows application

Affected:91.0.4472.77Fixed in:91.0.4472.77Google LLC

Google Chrome Dev (EXE)Windows application

Affected:91.0.4472.77Fixed in:91.0.4472.77Google LLC

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Exploit Intelligence

16.61%probability of exploitation in 30 days

97thpercentile

Very high risk: more likely to be exploited than 97% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Google Chromium PopupBlocker Security Bypass Vulnerability

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.

Apply updates per vendor instructions.

Remediation due: 2022-07-18

References

Patch1

crbug.com

Vendor Advisory1

chromereleases.googleblog.com

Third-Party Advisory1

security.gentoo.org

Government Resource1

cisa.gov

Mailing List2

Related Vulnerabilities

Other CWE-863 (Incorrect Authorization) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-22518	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-38035	Critical	9.8	100%	KEV + Ransom	-
CVE-2022-46169	Critical	9.8	100%	KEV	Fix
CVE-2024-38856	Critical	9.8	99%	KEV	Fix
CVE-2025-29927	Critical	9.1	99%	-	Fix
CVE-2020-36289	Medium	5.3	99%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-24.