What is CVE-2026-8528?

CVE-2026-8528 is a medium-severity vulnerability in Apple macOS, classified under Improper Input Validation. CVSS score: 4.3/10. Published 2026-05-14.

How severe is CVE-2026-8528?

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

Improper input validation in Apple macOS

CVE-2026-8528

Insufficient validation of untrusted input in SiteIsolation in Google Chrome prior to 148.0.7778.168 allowed a remote attacker who had compromised the renderer process to bypass Site Isolation via a crafted HTML page. (Chromium security severity: High)

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

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

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.

EPSS exploit prediction

EPSS: 0.003 (15.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 15.0% 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: 0.003 · change: +0.001

Affected products

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html (Release Notes, Vendor Advisory)
issues.chromium.org/issues/487795397 (Permissions Required)

Frequently asked questions

What is CVE-2026-8528?: CVE-2026-8528 is a medium-severity vulnerability in Apple macOS, classified under Improper Input Validation. CVSS score: 4.3/10. Published 2026-05-14.
How severe is CVE-2026-8528?: Medium severity. CVSS v3 base score is 4.3 out of 10.