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Mallory
Critical

Arbitrary JavaScript code execution in macOS Ventura

IdentifiersCVE-2023-40397CWE-94

Apple states that CVE-2023-40397 was fixed in macOS Ventura 13.5 and that the issue was addressed with improved checks. According to the provided content, a remote attacker may be able to cause arbitrary JavaScript code execution. No additional technical detail about the affected component, vulnerable function, or root cause is provided in the supplied material.

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For your environment

Are you exposed to this one?

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation may allow a remote attacker to trigger execution of arbitrary JavaScript in the affected context. Based on the provided content, this could affect the integrity of web or script-processing contexts, but the exact security boundary and downstream impact are not specified.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, reduce exposure to untrusted remote content and limit interaction with attacker-controlled web content or services that could deliver the triggering input. The provided content does not include any Apple-specific workaround beyond applying the fix.

Remediation

Patch, then assume compromise.

Upgrade affected systems to macOS Ventura 13.5 or later, as Apple indicates the issue is fixed in macOS Ventura 13.5.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
AppleMacosoperating_system
WebkitgtkWebkitgtkapplication
WpewebkitWpe Webkitapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity

Community discussion across Reddit, Mastodon, and other social sources.