CVE-2026-65776: Windows Win32k Elevation of Privilege Vulnerability

CSIRTS triage

What

A use-after-free vulnerability in Windows Win32k allows authorized attackers to elevate privileges locally.

Who is affected

Authenticated local users on systems running affected Windows versions can escalate privileges.

Urgency

High severity (CVSS 7.0) privilege escalation; prioritize patching.

Action

Install the latest Windows security update addressing the Win32k vulnerability.

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

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-2026-65776

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-2026-657760.22% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 13% of all EPSS-scored CVEs.

Referenced CVEs

Same CVEs, other sources

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

• unknownexploitedNCSC-2026-0284 [1.00] [M/H] Vulnerabilities patched in Microsoft Windowsncsc-nl
• highCVE-2026-65776: Use after free in Windows Win32K allows an authorized attacker to elevate privileges locally.nvd

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