What is CVE-2026-20618?

CVE-2026-20618 is a medium-severity vulnerability in Apple macOS, classified under Insecure Temporary File. CVSS score: 5.5/10. Published 2026-02-11.

How severe is CVE-2026-20618?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Apple macOS

CVE-2026-20618

An issue was addressed with improved handling of temporary files. This issue is fixed in macOS Tahoe 26.3. An app may be able to access user-sensitive data.

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

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/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-377 — Insecure Temporary File

References

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

Frequently asked questions

What is CVE-2026-20618?: CVE-2026-20618 is a medium-severity vulnerability in Apple macOS, classified under Insecure Temporary File. CVSS score: 5.5/10. Published 2026-02-11.
How severe is CVE-2026-20618?: Medium severity. CVSS v3 base score is 5.5 out of 10.