CVE-2026-83856

Published: Oct 13, 2026Modified: Oct 21, 2026

8.1

Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitability: 2.2 / Impact: 5.9

Source: NVD

Description

Out-of-bounds read in Windows Event Logging Service allows an unauthorized attacker to execute code over a network.

Affected (12)

Products: Microsoft: Windows 11 23h2, Windows 11 24h2, Windows 11 25h2, Windows 11 26h1, Windows 11 26h2, Windows Server 2022, Windows Server 2025

7 products

Windows 11 23h2

Windows 11 24h2

Windows 11 25h2

Windows 11 26h1

Windows 11 26h2

Windows Server 2022

Windows Server 2025

Configuration A

12 vulnerable

Vulnerable Software	Affected Versions
Microsoft Windows 11 23h2	version < 10.0.22631.7652
Microsoft Windows 11 23h2	version < 10.0.22631.7652
Microsoft Windows 11 24h2	version < 10.0.26100.9711
Microsoft Windows 11 24h2	version < 10.0.26100.9711
Microsoft Windows 11 25h2	version < 10.0.26200.9711
Microsoft Windows 11 25h2	version < 10.0.26200.9711
Microsoft Windows 11 26h1	version < 10.0.28000.3231
Microsoft Windows 11 26h1	version < 10.0.28000.3231
Microsoft Windows 11 26h2	version < 10.0.26300.9711
Microsoft Windows 11 26h2	version < 10.0.26300.9711
Microsoft Windows Server 2022	version < 10.0.20348.5761
Microsoft Windows Server 2025	version < 10.0.26100.33650

Related CWEs

Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83856

Source: secure@microsoft.com

PatchVendor Advisory

Timeline

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