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Severe, 6 weeks977Projects326

977 severe, 6 weeks · 326 projects

MicrosoftCVE-2026-83504

Microsoft Windows SmartScreen: race condition

Microsoft

CVE-2026-83504 · Published Oct 13, 2026 · updated Oct 28, 2026

Medium4.7
Fix: upgrade to 10.0.22631.7582 or later (4 fixed versions below)
Microsoft advisory

Time-of-check time-of-use (toctou) race condition in Windows SmartScreen allows an authorized attacker to disclose information locally.

Affected versions

PackageAffectedFixed in
Windows 11 Version 23H2
Product
>= 10.0.22631.0, < 10.0.22631.758210.0.22631.7582
Windows 11 Version 24H2
Product
>= 10.0.26100.0, < 10.0.26100.944510.0.26100.9445
Windows 11 Version 25H2
Product
>= 10.0.26200.0, < 10.0.26200.944510.0.26200.9445
Windows 11 version 23H2
Product
>= 10.0.22631.0, < 10.0.22631.758210.0.22631.7582
Windows 11 version 26H1
Product
>= 10.0.28000.0, < 10.0.28000.295410.0.28000.2954
Details and references
CVSS 3.1
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Severity from
the vendor (its own CVE record or advisory)
Weakness
CWE-367

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