Open Redirect in Microsoft Windows 10 Version 1607
CVE-2026-83646
Url redirection to untrusted site ('open redirect') in Active Directory Federation Services (AD FS) allows an authorized attacker to perform spoofing over a network.
Vulnerability class: Open Redirect
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Microsoft Windows 10 Version 1607
- Microsoft Windows 10 Version 1809
- Microsoft Windows Server 2016
- Microsoft Windows Server 2016 (Server Core Installation)
- Microsoft Windows Server 2019
- Microsoft Windows Server 2019 (Server Core Installation)
- Microsoft Windows Server 2022
- Microsoft Windows Server 2025
- Microsoft Windows Server 2025 (Server Core Installation)
Weakness classification (CWE)
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83646 (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2026-83646?
- CVE-2026-83646 is a medium-severity vulnerability in Microsoft Windows 10 Version 1607, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 4.8/10. Published 2026-10-13.
- How severe is CVE-2026-83646?
- Medium severity. CVSS v3 base score is 4.8 out of 10.