SB2026071726 - Multiple vulnerabilities in Microsoft Defender for Endpoint for Mac

Description

This security bulletin contains information about 3 vulnerabilities.

1) Time-of-check Time-of-use (TOCTOU) Race Condition (CVE-ID: CVE-2026-56178)

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

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to time-of-check time-of-use (toctou) race condition in Microsoft Defender for Endpoint for Mac, which leads to security restrictions bypass and privilege escalation.

2) Time-of-check Time-of-use (TOCTOU) Race Condition (CVE-ID: CVE-2026-50658)

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

CVSSv4: 7.3 [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]

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to time-of-check time-of-use (toctou) race condition in Microsoft Defender for Endpoint for Mac, which leads to security restrictions bypass and privilege escalation.

3) Exposure of Private Information ('Privacy Violation') (CVE-ID: CVE-2026-50657)

CWE-ID: CWE-359 - Exposure of Private Information ('Privacy Violation')

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to exposure of private personal information to an unauthorized actor in Microsoft Defender for Endpoint for Mac. A local user can gain unauthorized access to sensitive information on the system.

Remediation

Install update from vendor's website.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56178
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50658
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50657