Authentication Bypass by Spoofing in Microsoft Windows and Windows Server - CVE-2026-62759
Published: September 8, 2026
Vulnerability identifier: #VU147483
CSH Severity: Medium
CVSS v4: 7.7 [CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-62759
CWE-ID: CWE-290
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass authentication by spoofing.
The vulnerability exists due to authentication bypass by spoofing in Windows Netlogon when communicating over an adjacent network. A remote attacker can manipulate a malicious link, application, or file to disguise it as a legitimate link or file to bypass authentication by spoofing.
Successful exploitation requires specific conditions, including particular protocol settings or configurations.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-62759
Install security update from vendor's website.
Microsoft Windows - addressed in versions 10 21H2 10.0.19044.7725, 10 22H2 10.0.19045.7725, 10 1607 10.0.14393.9512, 10 1809 10.0.17763.9245, 11 23H2 10.0.22631.7582, 11 24H2 10.0.26100.9445, 11 25H2 10.0.26200.9445, 11 26H1 10.0.28000.2954
Windows Server - addressed in versions 2012 R2 6.3.9600.23397, 2012 6.2.9200.26349, 2016 10.0.14393.9512, 2019 10.0.17763.9245, 2022 10.0.20348.5622, 2025 10.0.26100.33438
Windows Server - addressed in versions 2012 R2 6.3.9600.23397, 2012 6.2.9200.26349, 2016 10.0.14393.9512, 2019 10.0.17763.9245, 2022 10.0.20348.5622, 2025 10.0.26100.33438