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CVE-2026-83864 is an authentication bypass vulnerability in Microsoft Windows 10 Version 1607 and related builds. It involves improper access control in the Windows NTFS component, allowing a local authorized attacker to disclose information. The vulnerability has a medium severity rating with a CVSS score of 5.5. Microsoft has released official fixes for affected versions. No known exploits are reported in the wild.

This vulnerability, tracked as CVE-2026-83864, is due to improper access control in the Windows NTFS file system on Windows 10 Version 1607 and other specified builds. It allows an authorized local attacker to bypass authentication mechanisms by spoofing, resulting in unauthorized information disclosure. The CVSS 3.1 vector indicates local attack vector, low attack complexity, low privileges required, no user interaction, unchanged scope, high confidentiality impact, no integrity or availability impact, and official remediation is available. Multiple Windows 10 versions are affected, with patches released to address the issue.

CVE-2026-83864 is an authentication bypass vulnerability in Microsoft Windows 10 Version 1607 and related builds. It involves improper access control in the Windows NTFS component, allowing a local authorized attacker to disclose information. The vulnerability has a medium severity rating with a CVS

CVE-2026-83864: CWE-290: Authentication Bypass by Spoofing in Microsoft Windows 10 Version 1607

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