What is CVE-2023-42940?

CVE-2023-42940 is a medium-severity vulnerability in Apple macOS, classified under Information Disclosure. CVSS score: 5.7/10. Published 2023-12-19.

How severe is CVE-2023-42940?

Medium severity. CVSS v3 base score is 5.7 out of 10.

Information disclosure in Apple macOS

CVE-2023-42940

A session rendering issue was addressed with improved session tracking. This issue is fixed in macOS Sonoma 14.2.1. A user who shares their screen may unintentionally share the incorrect content.

Vulnerability class: Information Disclosure

Published 2023-12-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.007 (51.7th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Apple macOS — versions unspecified

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

support.apple.com/en-us/HT214048 (Release Notes, Vendor Advisory)
seclists.org/fulldisclosure/2023/Dec/20 (Mailing List, Third Party Advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2023-42940?: CVE-2023-42940 is a medium-severity vulnerability in Apple macOS, classified under Information Disclosure. CVSS score: 5.7/10. Published 2023-12-19.
How severe is CVE-2023-42940?: Medium severity. CVSS v3 base score is 5.7 out of 10.