CVE-2026-62728: Windows Common Log File System Driver Elevation of Privilege Vulnerability

highCVSS 7CVE-2026-62728

Time-of-check time-of-use (toctou) race condition in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.

CSIRTS triage

vendor: Microsoft product: Windows Common Log File System Driver Privilege escalation

What: Time-of-check time-of-use race condition in CLFS driver allows local privilege escalation.
Who is affected: Authorized local users on Windows systems with CLFS driver in use.
Urgency: High priority; race conditions enabling privilege escalation require urgent patching.
Action: Apply Windows security updates addressing CVE-2026-62728 when available.

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: high — CVSS 7
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62728

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-2026-627280.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 9% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-62728	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.