What is CVE-2026-12457?

CVE-2026-12457 is a medium-severity vulnerability in Apple Macos, classified under Protection Mechanism Failure. CVSS score: 4.2/10. Published 2026-06-17.

How severe is CVE-2026-12457?

Medium severity. CVSS v3 base score is 4.2 out of 10.

Vulnerability in Apple Macos

CVE-2026-12457

Inappropriate implementation in Extensions in Google Chrome prior to 149.0.7827.155 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted HTML page. (Chromium security severity: High)

CVSS v3 metric

CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N.

Affected products

Apple Macos
Google Chrome — versions 149.0.7827.155
Linux Linux_kernel
Microsoft Windows

Weakness classification (CWE)

CWE-693 — Protection Mechanism Failure

References

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

Frequently asked questions

What is CVE-2026-12457?: CVE-2026-12457 is a medium-severity vulnerability in Apple Macos, classified under Protection Mechanism Failure. CVSS score: 4.2/10. Published 2026-06-17.
How severe is CVE-2026-12457?: Medium severity. CVSS v3 base score is 4.2 out of 10.