What is CVE-2026-28840?

CVE-2026-28840 is a high-severity vulnerability in Apple macOS, classified under Improper Privilege Management. CVSS score: 7.8/10. Published 2026-05-11.

How severe is CVE-2026-28840?

High severity. CVSS v3 base score is 7.8 out of 10.

Privilege escalation in Apple macOS

CVE-2026-28840

A permissions issue was addressed with additional restrictions. This issue is fixed in macOS Sequoia 15.7.7, macOS Sonoma 14.8.7, macOS Tahoe 26.4. An app may be able to gain root privileges.

Vulnerability class: Privilege Escalation

Published 2026-05-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.002 (3.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 3.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.000

Affected products

Apple macOS — versions 0

Weakness classification (CWE)

CWE-269 — Improper Privilege Management

References

support.apple.com/en-us/126794 (Release Notes, Vendor Advisory)
support.apple.com/en-us/127116 (Release Notes, Vendor Advisory)
support.apple.com/en-us/127117 (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2026-28840?: CVE-2026-28840 is a high-severity vulnerability in Apple macOS, classified under Improper Privilege Management. CVSS score: 7.8/10. Published 2026-05-11.
How severe is CVE-2026-28840?: High severity. CVSS v3 base score is 7.8 out of 10.