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CVE-2023-40397: The issue was addressed with improved checks

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CRITICAL 9.8REMOTEUPGRADEUPGRADEUPGRADE

CVE-2023-40397 is a critical-severity flaw (CVSS 9.8) affecting macos, webkitgtk, wpe webkit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

  • Critical severity
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score9.8 (Critical)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance1.7% (top 23%)
CISA exploited listNo
Published2023-09-06
Last modified2026-06-17
Publisher (CNA): Apple Inc. · Vendor: apple · webkitgtk · wpewebkit

Share: LinkedIn · X · Reddit

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

apple macos UPGRADE
Affected: < 13.5
Fixed in: 13.5
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
webkitgtk webkitgtk UPGRADE
Affected: < 2.40.5
Fixed in: 2.40.5
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy webkitgtk || rpm -q webkitgtk || webkitgtk --version
2. UPGRADE to 2.40.5 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade webkitgtk
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade webkitgtk
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
wpewebkit wpe webkit UPGRADE
Affected: < 2.40.5
Fixed in: 2.40.5
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy wpe-webkit || rpm -q wpe-webkit || wpe-webkit --version
2. UPGRADE to 2.40.5 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade wpe-webkit
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade wpe-webkit
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-40397?

macos: upgrade to 13.5; webkitgtk: upgrade to 2.40.5; wpe webkit: upgrade to 2.40.5. Exact commands for each OS are on this page.

Is CVE-2023-40397 being exploited?

CVE-2023-40397 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-40397 affect?

CVE-2023-40397 affects macos, webkitgtk, wpe webkit. Severity is critical (CVSS 9.8). 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.

How urgent is CVE-2023-40397?

Priority 58/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

macOS vulnerabilities · WebKit vulnerabilities · Apple Safari and WebKit vulnerabilities

Related CVEs

References

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