What is CVE-2026-9999?

CVE-2026-9999 is a high-severity vulnerability in Apple Macos, classified under Improper Privilege Management. CVSS score: 8.8/10. Published 2026-05-28.

How severe is CVE-2026-9999?

High severity. CVSS v3 base score is 8.8 out of 10.

Privilege escalation in Apple Macos

CVE-2026-9999

Inappropriate implementation in ANGLE in Google Chrome on Mac prior to 148.0.7778.216 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)

Vulnerability class: Privilege Escalation

EPSS: 0.001 (24.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Apple Macos
Google Chrome — versions 148.0.7778.216

Weakness classification (CWE)

CWE-269 — Improper Privilege Management

References

chrome-cve-admin@google.com (Vendor Advisory)
chrome-cve-admin@google.com (Permissions Required)

Frequently asked questions

What is CVE-2026-9999?: CVE-2026-9999 is a high-severity vulnerability in Apple Macos, classified under Improper Privilege Management. CVSS score: 8.8/10. Published 2026-05-28.
How severe is CVE-2026-9999?: High severity. CVSS v3 base score is 8.8 out of 10.