What is CVE-2026-11666?

CVE-2026-11666 is a medium-severity vulnerability in Apple macOS, classified under Improper Input Validation. CVSS score: 5.4/10. Published 2026-06-09.

How severe is CVE-2026-11666?

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

Improper input validation in Apple macOS

CVE-2026-11666

Insufficient validation of untrusted input in Input in Google Chrome prior to 149.0.7827.103 allowed a remote attacker to perform UI spoofing via a crafted HTML page. (Chromium security severity: High)

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2026-06-09 · last modified 2026-07-23.

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 (10.6th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 10.6% 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: 0.000

Affected products

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop_0153744… (Release Notes, Vendor Advisory)
issues.chromium.org/issues/514009323 (Permissions Required)

Frequently asked questions

What is CVE-2026-11666?: CVE-2026-11666 is a medium-severity vulnerability in Apple macOS, classified under Improper Input Validation. CVSS score: 5.4/10. Published 2026-06-09.
How severe is CVE-2026-11666?: Medium severity. CVSS v3 base score is 5.4 out of 10.