What is CVE-2023-40397?

CVE-2023-40397 is a critical-severity vulnerability in Apple macOS. CVSS score: 9.8/10. Published 2023-09-06.

How severe is CVE-2023-40397?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Apple macOS

CVE-2023-40397

The issue was addressed with improved checks. This issue is fixed in macOS Ventura 13.5. A remote attacker may be able to cause arbitrary javascript code execution.

Published 2023-09-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.017 (75.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 75.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.017 · change: +0.001

Affected products

Apple macOS — versions unspecified
Webkitgtk
Wpewebkit Wpe Webkit

References

support.apple.com/en-us/HT213843 (Release Notes, Vendor Advisory)
www.openwall.com/lists/oss-security/2023/09/11/1 (Mailing List, Third Party Advisory)
security.gentoo.org/glsa/202401-04

Frequently asked questions

What is CVE-2023-40397?: CVE-2023-40397 is a critical-severity vulnerability in Apple macOS. CVSS score: 9.8/10. Published 2023-09-06.
How severe is CVE-2023-40397?: Critical severity. CVSS v3 base score is 9.8 out of 10.