CVE-2026-12374CWE-295CWE-367

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

Medium · published July 1, 2026

CVSS v4.0
6.4
EPSS
0%
Percentile
0.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.4 · MEDIUM
Vector
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/AU:Y/R:U/V:C/RE:L/U:Amber
EPSS
0.00073 · 0.1th percentile
Weaknesses
CWE-295 · Improper Certificate Validation; CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition
Published
2026-07-01T14:07Z
EPSS history
Timeline
  • 01 JUL 14:07Z
    Improper XPC caller certificate validation and TOCTOU race condition in macOS PrivilegedHelperTool
    cvelistv5