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Windows Event Logging EUVDEUVD-2026-56321

| CVE-2026-61347 MEDIUM
Buffer Over-read (CWE-126)
2026-08-11 secure@microsoft.com GHSA-9v97-qx3j-hxj6
Buffer Overflow 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
5.5
CVSS 3.1 · Vendor: microsoft
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Severity by source

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

Local-only vector confirmed by description; PR:L reflects 'authorized attacker' requirement; read-only over-read yields C:H with no integrity or availability impact.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
4.0 AV:L/AC:L/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
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

3
Analysis Generated
Aug 11, 2026 - 23:14 vuln.today
Patch available
Aug 11, 2026 - 18:19 EUVD
CVE Published
Aug 11, 2026 - 17:18 cve.org
MEDIUM 5.5

DescriptionCVE.org

Buffer over-read in Windows Event Logging Service allows an authorized attacker to disclose information locally.

AnalysisAI

Information disclosure in the Windows Event Logging Service exposes high-confidentiality data to any locally authenticated attacker via a CWE-126 buffer over-read, with no code execution possible. The vulnerability spans an exceptionally broad surface: every supported Windows client and server release from Windows Server 2012 and Windows 10 1607 through Windows 11 26H1 and Windows Server 2025 is affected. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Delivery
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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated local session with at least standard user (low) privileges on the target Windows host - the CVSS PR:L metric confirms this. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N, score 5.5 Medium) accurately characterises this as a local, low-privilege, zero-interaction information-disclosure flaw. … 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 Apply Microsoft's security update for the affected Windows build via Windows Update, WSUS, or Microsoft Update Catalog - fixed builds are: Server 2012 to 6.2.9200.26279, Server 2012 R2 to 6.3.9600.23337, Windows 10 1607 / Server 2016 to 10.0.14393.9418, Windows 10 1809 / Server 2019 to 10.0.17763.9115, Server 2022 to 10.0.20348.5499, Windows 10 21H2 to 10.0.19044.7663, Windows 10 22H2 to 10.0.19045.7663, Windows 11 23H2 to 10.0.22631.7517, Windows 11 24H2 / Server 2025 to 10.0.26100.9168 or 10.0.26100.33296 respectively, Windows 11 25H2 to 10.0.26200.9168, Windows 11 26H1 to 10.0.28000.2704. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-56321 vulnerability details – vuln.today
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