What is CVE-2026-56178?

CVE-2026-56178 is a medium-severity vulnerability in Microsoft Defender For Endpoint Mac, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 5.5/10. Published 2026-07-14.

How severe is CVE-2026-56178?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Microsoft Defender For Endpoint Mac

CVE-2026-56178

Time-of-check time-of-use (toctou) race condition in Microsoft Defender for Endpoint allows an authorized attacker to elevate privileges locally.

Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

Affected products

Microsoft Defender For Endpoint Mac — versions 101.0.0

Weakness classification (CWE)

CWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition

References

secure@microsoft.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-56178?: CVE-2026-56178 is a medium-severity vulnerability in Microsoft Defender For Endpoint Mac, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 5.5/10. Published 2026-07-14.
How severe is CVE-2026-56178?: Medium severity. CVSS v3 base score is 5.5 out of 10.