EUVD-2026-44298
GHSA-38mf-9pq4-p59q
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local execution under standard user privileges (PR:L, AV:L) required; confidentiality-only impact matches a read-access security feature bypass with no write or DoS effect.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Improper access control in Windows Kernel allows an authorized attacker to bypass a security feature locally.
AnalysisAI
Windows Kernel security feature bypass across Windows 10, 11, and Server 2012 through 2025 allows a local authenticated attacker to circumvent kernel-enforced access controls, resulting in high-confidence disclosure of sensitive information (C:H). Rooted in CWE-284 (Improper Access Control), the flaw enables a privilege-constrained local user to read protected data beyond their authorization boundary. No public exploit code or active exploitation has been identified at time of analysis; EPSS sits at 0.25% (16th percentile) and SSVC assigns exploitation status 'none,' consistently characterizing this as a standard patch-cycle priority rather than an emergency response item.
Technical ContextAI
The Windows Kernel implements access control enforcement across memory protection, access tokens, and security descriptor validation. CWE-284 (Improper Access Control) indicates a specific kernel code path fails to correctly verify or enforce access restrictions, permitting a lower-privileged process to bypass an intended security boundary and read protected resources. The CVSS vector (AV:L/AC:L/PR:L/UI:N) confirms that exploitation requires only local code execution under a standard user account with no elevated complexity or user interaction. CPE strings confirm the affected surface spans Windows 10 versions 1607, 1809, 21H2, and 22H2; Windows 11 versions 24H2, 25H2, and 26H1; and Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025 in both standard and Server Core configurations - covering both legacy and current-generation Microsoft platforms.
RemediationAI
Apply Microsoft's security update via Windows Update or WSUS, as confirmed available through the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58545. Specific patched build targets per EUVD-2026-44298: Windows 10 22H2 to 10.0.19045.7548 or later; Windows 10 21H2 to 10.0.19044.7548 or later; Windows 10 1809 and Server 2019 to 10.0.17763.9020 or later; Windows 10 1607 and Server 2016 to 10.0.14393.9339 or later; Windows 11 24H2 to 10.0.26100.8875 or later; Windows 11 25H2 to 10.0.26100.8875 or later; Windows 11 26H1 to 10.0.28000.2525 or later; Windows Server 2022 to 10.0.20348.5386 or later; Windows Server 2025 to 10.0.26100.33158 or later; Windows Server 2012 to 6.2.9200.26226 or later; Windows Server 2012 R2 to 6.3.9600.23291 or later. For environments where immediate patching is not feasible, restrict local interactive and remote desktop logon rights to only trusted, operationally necessary user accounts - this directly reduces the PR:L attack surface. Note that Windows Server 2012 and 2012 R2 are in Extended Security Update (ESU) status; organizations must verify active ESU enrollment to receive this patch.
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External POC / Exploit Code
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