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Windows Win32K CVE-2026-69853

| EUVDEUVD-2026-73611 MEDIUM
Use of Uninitialized Resource (CWE-908)
2026-09-08 secure@microsoft.com GHSA-8j9j-hfvh-f7g5
Information Disclosure Microsoft Windows 10 1607 Windows 10 1809 Windows 10 21h2 Windows 10 22h2 Windows 11 23h2 Windows 11 24h2 Windows 11 25h2 Windows 11 26h1 Windows Server 2012 Windows Server 2016 Windows Server 2019 Windows Server 2022 Windows Server 2025
4.7
CVSS 3.1 · Vendor: microsoft
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Severity by source

Vendor (microsoft) PRIMARY
4.7 MEDIUM
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
vuln.today AI
4.7 MEDIUM

Local access and low-privilege user required; high complexity for trigger; confidentiality-only impact from kernel memory read; no integrity or availability effect.

3.1 AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
4.0 AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (microsoft).

CVSS VectorVendor: microsoft

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

3
Analysis Generated
Sep 09, 2026 - 04:56 vuln.today
Patch available
Sep 08, 2026 - 18:35 EUVD
CVE Published
Sep 08, 2026 - 18:19 cve.org
MEDIUM 4.7

DescriptionCVE.org

Use of uninitialized resource in Windows Win32K allows an authorized attacker to disclose information locally.

AnalysisAI

Uninitialized kernel memory in Win32K (win32k.sys) enables local attackers with standard user privileges to read sensitive kernel memory contents on affected Windows systems. The vulnerability spans virtually all currently supported Windows client and server releases, from Windows Server 2012 through Windows Server 2025 and Windows 11 25H2/26H1. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Exploit
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Execution
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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated local session - the attacker must be able to execute arbitrary code in user context on the target host (PR:L). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 base score of 4.7 (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N) accurately reflects an information-disclosure-only finding: no integrity or availability impact, local access required, and elevated attack complexity. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patch: apply the Windows security update corresponding to each affected build - targeting build numbers 10.0.14393.9512 (Server 2016/Win10 1607), 10.0.17763.9245 (Server 2019/Win10 1809), 10.0.19044.7725 or 10.0.19045.7725 (Win10 21H2/22H2), 10.0.22631.7582 (Win11 23H2), 10.0.26100.9445 (Win11 24H2/25H2), 10.0.28000.2954 (Win11 26H1), 10.0.20348.5622 (Server 2022), 10.0.26100.33438 (Server 2025), 6.2.9200.26349 (Server 2012), or 6.3.9600.23397 (Server 2012 R2) via Windows Update or WSUS. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-69853 vulnerability details – vuln.today
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