CVE-2026-45647: Microsoft Defender for Endpoint for Mac Elevation of Privilege Vulnerability

mediumCVSS 5.5CVE-2026-45647

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

CSIRTS triage

vendor: Microsoft product: Microsoft Defender for Endpoint for Mac Privilege escalation

What: Time-of-check time-of-use (toctou) race condition in Microsoft Defender for Endpoint allows an authorized attacker to elevate privileges locally.
Who is affected: Authorized attackers with access to the system can exploit this vulnerability.
Urgency: Remediation is medium urgency due to the potential for privilege escalation.
Action: Apply the latest security updates from Microsoft.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.5
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45647

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-456470.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 12% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-45647	coverage & exploitation status	NVD · CVE.org

Recent advisories for Microsoft Defender for

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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