What is CVE-2026-17821?

CVE-2026-17821 is a medium-severity vulnerability in Google Chrome, classified under CWE-602. CVSS score: 6.5/10. Published 2026-07-30.

How severe is CVE-2026-17821?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Google Chrome

CVE-2026-17821

Insufficient policy enforcement in Extensions in Google Chrome prior to 151.0.7922.72 allowed an attacker who convinced a user to install a malicious extension to bypass navigation restrictions via a crafted Chrome Extension. (Chromium security severity: Medium)

EPSS: 0.002 (10.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.

Affected products

Google Chrome — versions 151.0.7922.72

Weakness classification (CWE)

CWE-602

References

chrome-cve-admin@google.com (Release Notes, Vendor Advisory)
chrome-cve-admin@google.com (Permissions Required)

Frequently asked questions

What is CVE-2026-17821?: CVE-2026-17821 is a medium-severity vulnerability in Google Chrome, classified under CWE-602. CVSS score: 6.5/10. Published 2026-07-30.
How severe is CVE-2026-17821?: Medium severity. CVSS v3 base score is 6.5 out of 10.