What is CVE-2026-5911?

CVE-2026-5911 is a medium-severity vulnerability in Apple Macos, classified under Protection Mechanism Failure. CVSS score: 4.3/10. Published 2026-04-08.

How severe is CVE-2026-5911?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Apple Macos

CVE-2026-5911

Policy bypass in ServiceWorkers in Google Chrome prior to 147.0.7727.55 allowed a remote attacker to bypass content security policy via a crafted HTML page. (Chromium security severity: Low)

EPSS: 0.000 (11.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

Affected products

Apple Macos
Google Chrome — versions 147.0.7727.55
Linux Linux_kernel
Microsoft Windows

Weakness classification (CWE)

CWE-693 — Protection Mechanism Failure

References

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

Frequently asked questions

What is CVE-2026-5911?: CVE-2026-5911 is a medium-severity vulnerability in Apple Macos, classified under Protection Mechanism Failure. CVSS score: 4.3/10. Published 2026-04-08.
How severe is CVE-2026-5911?: Medium severity. CVSS v3 base score is 4.3 out of 10.