What is CVE-2026-8561?

CVE-2026-8561 is a medium-severity vulnerability in Apple macOS, classified under User Interface (UI) Misrepresentation of Critical Information. CVSS score: 5.4/10. Published 2026-05-14.

How severe is CVE-2026-8561?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in Apple macOS

CVE-2026-8561

Incorrect security UI in Fullscreen in Google Chrome prior to 148.0.7778.168 allowed a remote attacker to perform UI spoofing via a crafted HTML page. (Chromium security severity: Medium)

Published 2026-05-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L.

EPSS exploit prediction

EPSS: 0.002 (13.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 13.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.001

Affected products

Weakness classification (CWE)

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

References

chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html (Product, Vendor Advisory)
issues.chromium.org/issues/343352552 (Permissions Required)

Frequently asked questions

What is CVE-2026-8561?: CVE-2026-8561 is a medium-severity vulnerability in Apple macOS, classified under User Interface (UI) Misrepresentation of Critical Information. CVSS score: 5.4/10. Published 2026-05-14.
How severe is CVE-2026-8561?: Medium severity. CVSS v3 base score is 5.4 out of 10.