What is CVE-2026-20603?

CVE-2026-20603 is a medium-severity vulnerability in Apple macOS, classified under Improper Access Control. CVSS score: 4.4/10. Published 2026-02-11.

How severe is CVE-2026-20603?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Vulnerability in Apple macOS

CVE-2026-20603

This issue was addressed with improved redaction of sensitive information. This issue is fixed in macOS Tahoe 26.3. An app with root privileges may be able to access private information.

Published 2026-02-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.001 (2.6th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 2.6% 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: 0.001 · change: +0.000

Affected products

Apple macOS — versions 0

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

support.apple.com/en-us/126348 (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2026-20603?: CVE-2026-20603 is a medium-severity vulnerability in Apple macOS, classified under Improper Access Control. CVSS score: 4.4/10. Published 2026-02-11.
How severe is CVE-2026-20603?: Medium severity. CVSS v3 base score is 4.4 out of 10.