What is CVE-2026-9124?

CVE-2026-9124 is a medium-severity vulnerability in Apple macOS, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2026-05-20.

How severe is CVE-2026-9124?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Improper input validation in Apple macOS

CVE-2026-9124

Insufficient validation of untrusted input in Input in Google Chrome on prior to 148.0.7778.179 allowed a remote attacker who had compromised the renderer process to leak cross-origin data via a crafted HTML page. (Chromium security severity: Medium)

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

Published 2026-05-20 · last modified 2026-07-23.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (18.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 18.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0841193… (Vendor Advisory)
issues.chromium.org/issues/496375695 (Permissions Required)

Frequently asked questions

What is CVE-2026-9124?: CVE-2026-9124 is a medium-severity vulnerability in Apple macOS, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2026-05-20.
How severe is CVE-2026-9124?: Medium severity. CVSS v3 base score is 5.3 out of 10.