Open redirect in Microsoft Windows and Windows Server - CVE-2026-83500
Published: October 14, 2026
Vulnerability identifier: #VU154738
CSH Severity: Medium
CVSS v4: 6.8 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-83500
CWE-ID: CWE-601
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an attacker with physical access to bypass Secure Boot to run unauthorized code.
The vulnerability exists due to URL redirection to an untrusted site (open redirect) in Windows BitLocker when handling URL redirection. An attacker with physical access can exploit the open redirect through physical access to bypass Secure Boot to run unauthorized code.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-83500
Install security update from vendor's website.
Microsoft Windows - addressed in versions 10 21H2 10.0.19044.7807, 10 1607 10.0.14393.9612, 10 1809 10.0.17763.9376, 11 23H2 10.0.22631.7652, 11 24H2 10.0.26100.9711, 11 25H2 10.0.26200.9711, 11 26H1 10.0.28000.3231
Windows Server - addressed in versions 2016 10.0.14393.9612, 2019 10.0.17763.9376, 2022 10.0.20348.5761, 2025 10.0.26100.33650
Windows Server - addressed in versions 2016 10.0.14393.9612, 2019 10.0.17763.9376, 2022 10.0.20348.5761, 2025 10.0.26100.33650