EUVD-2026-43842
GHSA-5vv7-6vxh-x79w
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Local-only attack vector and low-privilege requirement reflect authenticated local session needed; integrity-only high impact matches security feature bypass with no data disclosure or availability loss.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Improper privilege management in Microsoft Windows DNS allows an authorized attacker to bypass a security feature locally.
AnalysisAI
Security feature bypass via improper privilege management (CWE-269) in Microsoft Windows DNS grants a locally authenticated attacker the ability to circumvent an unspecified security control, resulting in high integrity impact on affected Windows 11 and Windows Server 2025 systems. Affected platforms include Windows 11 versions 24H2, 25H2, and 26H1, as well as Windows Server 2025 in both full and Server Core configurations. No active exploitation has been confirmed by CISA KEV, EPSS probability is very low at 0.22% (13th percentile), and SSVC rates exploitation status as none - indicating this is a patched local-only issue without known active abuse.
Technical ContextAI
The vulnerability resides in the DNS component of Microsoft Windows, tracked under CWE-269 (Improper Privilege Management), which describes flaws where software fails to correctly assign, enforce, or restrict the privileges of a principal - allowing an actor to exercise permissions beyond their intended scope. In this case, the DNS service (a privileged system component) on Windows 11 and Windows Server 2025 mismanages privilege boundaries in a way that a low-privileged local user can exploit to bypass a security feature. The CVSS vector (AV:L/AC:L/PR:L) confirms the flaw is local, low-complexity, and requires only a standard user account. Affected CPEs span cpe:2.3:a:microsoft:windows_11_version_24h2, windows_11_version_25h2, windows_11_version_26h1, windows_server_2025, and windows_server_2025_(server_core_installation). The scope is unchanged (S:U), indicating the exploit does not escape the vulnerable component's security context.
RemediationAI
Apply the Microsoft-released patch addressing CVE-2026-50295, available through Windows Update and documented at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50295. Exact fixed build versions per EUVD data are: Windows 11 24H2 → 10.0.26100.8875, Windows 11 25H2 → 10.0.26200.8875, Windows 11 26H1 → 10.0.28000.2269, Windows Server 2025 and Server Core → 10.0.26100.33158. Because exploitation requires local authenticated access, organizations should also enforce least-privilege access controls - ensuring standard users cannot gain local shell or interactive sessions on DNS servers - as a compensating control where immediate patching is not possible. Restricting local logon rights via Group Policy (User Rights Assignment: 'Allow log on locally') on Windows Server 2025 DNS servers limits the attacker population, though this does not eliminate the vulnerability and patching remains the definitive fix.
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Same weakness CWE-269 – Improper Privilege Management
View allSame technique Privilege Escalation
View allShare
External POC / Exploit Code
Leaving vuln.today