Name: Microsoft Windows: CVE-2026-83856: Windows Event Logging Service Remote Code Execution Vulnerability
Creator: Rapid7
Published: 2026-10-13T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-83856, CWE-125, CVSS 7.5, EPSS 0.00569

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

CVSS Details

CVSS 3.1 Base Score: 7.5
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Microsoft Windows	—	2026-10 Cumulative Update for Microsoft Windows 11, version 26H1 (KB5127646)2026-10 Cumulative Update for Microsoft Windows 11, version 25H2 (KB5127648)2026-10 Cumulative Update for Microsoft Windows Server 2025, version 24H2 (KB5126646)2026-10 Cumulative Update for Microsoft Windows Server 2022, version 21H2 (KB5126655)2026-10 Cumulative Update for Microsoft Windows 11, version 23H2 (KB5126653)2026-10 Cumulative Update for Microsoft Windows Server 2022, version 22H2 (KB5126655)2026-10 Cumulative Update for Microsoft Windows 11, version 24H2 (KB5127648)	Oct 13, 2026	Oct 13, 2026

Prioritise with Active Threat Intelligence

With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.

Explore Intelligence Hub

MDR Buyer's Guide

Global Threat Landscape Report

Grow your business

CVSS Details

Covered by Rapid7

Prioritise with Active Threat Intelligence