Oct 2026: Windows Internet (wininet.dll) Tampering Vulnerability
CVE-2026-83865 Published on October 13, 2026

Windows Internet (wininet.dll) Tampering Vulnerability
Relative path traversal in Windows Internet (wininet.dll) allows an authorized attacker to perform tampering locally.

Vendor Advisory NVD

Weakness Type

Relative Path Traversal

The software uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory. This allows attackers to traverse the file system to access files or directories that are outside of the restricted directory.

Products Associated with CVE-2026-83865

Want to know whenever a new CVE is published for Microsoft products? stack.watch will email you.

Microsoft Windows 11 Version 26h2 X64 Based Systems

Microsoft Windows 10

Microsoft Windows Server 2019

Microsoft Windows Server 2022

Microsoft Windows Server 2025

Microsoft Windows 11 25h2

Microsoft Windows 11 23h2

Microsoft Windows 11 24h2

Microsoft Windows 11 26h1

Microsoft Windows Server 2016

Microsoft Windows Server 2012

Microsoft Windows Server 2012 R2

Affected Versions

Microsoft Windows 10 Version 1607:

Version 10.0.14393.0 and below 10.0.14393.9612 is affected.

Microsoft Windows 10 Version 1809:

Version 10.0.17763.0 and below 10.0.17763.9376 is affected.

Microsoft Windows 10 Version 21H2:

Version 10.0.19044.0 and below 10.0.19044.7807 is affected.

Microsoft Windows 10 Version 22H2:

Version 10.0.19045.0 and below 10.0.19045.7807 is affected.

Microsoft Windows 11 version 23H2:

Version 10.0.22631.0 and below 10.0.22631.7652 is affected.

Microsoft Windows 11 Version 23H2:

Version 10.0.22631.0 and below 10.0.22631.7652 is affected.

Microsoft Windows 11 Version 24H2:

Version 10.0.26100.0 and below 10.0.26100.9711 is affected.

Microsoft Windows 11 Version 25H2:

Version 10.0.26200.0 and below 10.0.26200.9711 is affected.

Microsoft Windows 11 version 26H1:

Version 10.0.28000.0 and below 10.0.28000.3231 is affected.

Microsoft Windows 11 Version 26H2:

Version 10.0.26300.0 and below 10.0.26300.9711 is affected.

Microsoft Windows Server 2012:

Version 6.2.9200.0 and below 6.2.9200.26434 is affected.

Microsoft Windows Server 2012 (Server Core installation):

Version 6.2.9200.0 and below 6.2.9200.26434 is affected.

Microsoft Windows Server 2012 R2:

Version 6.3.9600.0 and below 6.3.9600.23470 is affected.

Microsoft Windows Server 2012 R2 (Server Core installation):

Version 6.3.9600.0 and below 6.3.9600.23470 is affected.

Microsoft Windows Server 2016:

Version 10.0.14393.0 and below 10.0.14393.9612 is affected.

Microsoft Windows Server 2016 (Server Core installation):

Version 10.0.14393.0 and below 10.0.14393.9612 is affected.

Microsoft Windows Server 2019:

Version 10.0.17763.0 and below 10.0.17763.9376 is affected.

Microsoft Windows Server 2019 (Server Core installation):

Version 10.0.17763.0 and below 10.0.17763.9376 is affected.

Microsoft Windows Server 2022:

Version 10.0.20348.0 and below 10.0.20348.5761 is affected.

Microsoft Windows Server 2025:

Version 10.0.26100.0 and below 10.0.26100.33650 is affected.

Microsoft Windows Server 2025 (Server Core installation):

Version 10.0.26100.0 and below 10.0.26100.33650 is affected.

Oct 2026: Windows Internet (wininet.dll) Tampering VulnerabilityCVE-2026-83865 Published on October 13, 2026

Weakness Type

Relative Path Traversal

Products Associated with CVE-2026-83865

Affected Versions

Oct 2026: Windows Internet (wininet.dll) Tampering Vulnerability
CVE-2026-83865 Published on October 13, 2026