CVE-2026-83504 Windows SmartScreen Information Disclosure Vulnerability
A local race condition in Windows SmartScreen allows an authorized attacker to disclose sensitive information.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-83504?
CVE-2026-83504 is a medium-severity vulnerability in Microsoft Windows 11 23h2, published on 13 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Time-of-check time-of-use (toctou) race condition in Windows SmartScreen allows an authorized attacker to disclose information locally.
Weakness: CWE-367
Which versions are affected by CVE-2026-83504?
It affects 4 products.
Products include Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows 11 26h1.
How do I fix CVE-2026-83504?
No fix has been published for CVE-2026-83504 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-83504 being exploited?
There is no known exploitation of CVE-2026-83504 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 11 23h2
- CVE-2026-81963 Microsoft Windows Link Following
- CVE-2026-100219 Microsoft QUIC Remote Code Execution Vulnerability
- CVE-2026-96909 Windows BitLocker Remote Code Execution Vulnerability
- CVE-2026-62815 Microsoft QUIC Remote Code Execution Vulnerability
- CVE-2026-45657 Windows Kernel Remote Code Execution Vulnerability
Sources
Also known as GHSA-95mj-2jqr-r568.