All vulnerabilities
CVE-2026-83504

Windows SmartScreen Information Disclosure Vulnerability

Microsoft Windows 11 version 23H2Operating systems
Open in ThreatlineRecord JSON
CVSS
4.7Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.24%Chance of exploitation activity in the next 30 days, higher than 14% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in10.0.22631.7582Also 10.0.26100.9445, 10.0.26200.9445 and 1 moreCVE List
Published13 Oct 2026Updated 23 Oct 2026CVE List

What fixes it

  • 10.0.22631.7582Windows 11 version 23H2CVE List
  • 10.0.22631.7582Windows 11 Version 23H2CVE List
  • 10.0.26100.9445Windows 11 Version 24H2CVE List
  • 10.0.26200.9445Windows 11 Version 25H2CVE List
  • 10.0.28000.2954Windows 11 version 26H1CVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Vendor and government advisories 1

Vendors that say their products are affected, and agencies that issued alerts. Check each for the fixed release of the product you run.

Reports 1

1 outlet mention it. Reports are not confirmation; each links to its source.

Description

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

Text from CVE List

Affected versions 5

  • Windows 11 version 23H2affected: 10.0.22631.0 before 10.0.22631.7582CVE List
  • Windows 11 Version 23H2affected: 10.0.22631.0 before 10.0.22631.7582CVE List
  • Windows 11 Version 24H2affected: 10.0.26100.0 before 10.0.26100.9445CVE List
  • Windows 11 Version 25H2affected: 10.0.26200.0 before 10.0.26200.9445CVE List
  • Windows 11 version 26H1affected: 10.0.28000.0 before 10.0.28000.2954CVE List

References 1