EUVD-2026-44095
GHSA-qhxp-2823-2pw9
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable RPC service with no user interaction (AV:N/AC:L/UI:N) but requiring valid credentials (PR:L); code execution yields total compromise (C:H/I:H/A:H), scope unchanged.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
Lifecycle Timeline
5DescriptionNVD
Insufficient granularity of access control in Windows Event Logging Service allows an authorized attacker to execute code over a network.
AnalysisAI
Remote code execution in the Windows Event Logging Service affects a broad range of Microsoft Windows client and server releases (Windows 10 1607 through Windows 11 26H1, and Windows Server 2012 through 2025), where insufficient granularity of access controls (CWE-1220) lets an authenticated attacker with low privileges execute code over the network with high confidentiality, integrity, and availability impact. Microsoft has released patches for all affected builds. There is no public exploit identified at time of analysis and CISA has not listed it in KEV, with a low EPSS score of 0.61%.
Technical ContextAI
The affected component is the Windows Event Logging Service (the EventLog service, historically eventlog/wevtsvc), a core operating-system subsystem that collects, stores, and exposes system, security, and application event records and is reachable remotely via RPC. The root cause is classified as CWE-1220, Insufficient Granularity of Access Control, meaning the service enforces access decisions at too coarse a level, so an authenticated principal that should only have limited rights can reach privileged operations that permit code execution. The CPE data confirms the flaw spans the Microsoft Windows and Windows Server code base broadly - from Windows 10 Version 1607 and Server 2012 up through Windows 11 Version 26H1 and Server 2025, including Server Core installations - indicating the defective access-control logic lives in shared OS-level event-logging code rather than an edition-specific feature.
RemediationAI
Apply the Microsoft security update for your specific OS build, referencing the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50502. Vendor-released patched builds are: Windows 10 1607/Server 2016 at 10.0.14393.9339, Windows 10 1809/Server 2019 at 10.0.17763.9020, Windows 10 21H2 at 10.0.19044.7548, Windows 10 22H2 at 10.0.19045.7548, Windows 11 24H2/Server 2025 at 10.0.26100.8875/10.0.26100.33158 respectively, Windows 11 25H2 at 10.0.26200.8875, Windows 11 26H1 at 10.0.28000.2269, Server 2012 at 6.2.9200.26226, Server 2012 R2 at 6.3.9600.23291, and Server 2022 at 10.0.20348.5386. As a compensating control until patched, restrict network access to the Event Log RPC/remote event-management interfaces by blocking or firewalling remote RPC and the RemoteEventLogSvc (135/tcp plus the dynamic RPC range) to only trusted management hosts, and tighten who holds valid low-privilege credentials since PR:L is required; note the trade-off that blocking remote event-log RPC will break legitimate remote log collection and centralized monitoring, so scope firewall rules to management subnets rather than applying them universally.
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