What is CVE-2026-5891?

CVE-2026-5891 is a medium-severity vulnerability in Apple Macos, classified under User Interface (UI) Misrepresentation of Critical Information. CVSS score: 4.3/10. Published 2026-04-08.

How severe is CVE-2026-5891?

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

Vulnerability in Apple Macos

CVE-2026-5891

Insufficient policy enforcement in browser UI in Google Chrome prior to 147.0.7727.55 allowed a remote attacker who had compromised the renderer process to perform UI spoofing via a crafted HTML page. (Chromium security severity: Medium)

EPSS: 0.002 (10.9th 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:N/A:L.

Affected products

Weakness classification (CWE)

CWE-451 — User Interface (UI) Misrepresentation of Critical Information

References

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

Frequently asked questions

What is CVE-2026-5891?: CVE-2026-5891 is a medium-severity vulnerability in Apple Macos, classified under User Interface (UI) Misrepresentation of Critical Information. CVSS score: 4.3/10. Published 2026-04-08.
How severe is CVE-2026-5891?: Medium severity. CVSS v3 base score is 4.3 out of 10.