What is CVE-2026-28821?

CVE-2026-28821 is a high-severity vulnerability in Apple macOS, classified under Improper Input Validation. CVSS score: 8.4/10. Published 2026-03-25.

How severe is CVE-2026-28821?

High severity. CVSS v3 base score is 8.4 out of 10.

Improper input validation in Apple macOS

CVE-2026-28821

A validation issue existed in the entitlement verification. This issue was addressed with improved validation of the process entitlement. This issue is fixed in macOS Sequoia 15.7.5, macOS Sonoma 14.8.5, macOS Tahoe 26.4. An app may be able to gain elevated privileges.

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

EPSS: 0.002 (11.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Apple Macos — versions 0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

product-security@apple.com (Release Notes, Vendor Advisory)
product-security@apple.com (Release Notes, Vendor Advisory)
product-security@apple.com (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2026-28821?: CVE-2026-28821 is a high-severity vulnerability in Apple macOS, classified under Improper Input Validation. CVSS score: 8.4/10. Published 2026-03-25.
How severe is CVE-2026-28821?: High severity. CVSS v3 base score is 8.4 out of 10.