CVE-2026-12374

Improper XPC caller certificate validation and TOCTOU race condition in macOS PrivilegedHelperTool

MEDIUM

6.4

CVSS Score

Published: July 1, 2026 at 02:07 PM UTC

Updated: October 25, 2026 at 05:10 PM UTC

1 product affected across 1 vendorCato Client

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Severity

MEDIUM6.4

Exploit prediction

EPSS 0.1%

SSVC

No known exploit

Description

Improper certificate validation and a time-of-check time-of-use (TOCTOU) race condition in the PrivilegedHelperTool XPC service in Cato Client before v.5.13.1 on macOS allows a local authenticated attacker to escalate privileges to root via a self-signed certificate that bypasses the XPC caller verification and a symlink swap during package installation.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Cato Client · Catonetworks

90%

5.12.0 ≤ v < 5.13.15.12.0

Affected range stops below 5.13.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Source: cverecord

https://support.catonetworks.com/hc/en-us/articles/37284626576413-Security-Vulnerability-CVE-2026-12374-that-Impacts-macOS-Client-Versions-Lower-than-5-13-1

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.4MEDIUMCato

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-295CWE-367

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