Improper privilege management in Microsoft Windows and Windows Server - CVE-2026-83845
Published: October 14, 2026
Vulnerability identifier: #VU154993
CSH Severity: Low
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-83845
CWE-ID: CWE-269
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to read or modify another package's cookies.
The vulnerability exists due to improper privilege management in Windows Internet (wininet.dll) when handling local requests. A local user can send a local request claiming the identity of another package belonging to the same user to read or modify that package's cookies.
Exploitation requires running code in a low-integrity AppContainer. No additional user interaction is required.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-83845
Install security update from vendor's website.
Microsoft Windows - addressed in versions 10 21H2 10.0.19044.7807, 11 23H2 10.0.22631.7652, 11 24H2 10.0.26100.9711, 11 25H2 10.0.26200.9711, 11 26H1 10.0.28000.3231
Windows Server - addressed in versions 2022 10.0.20348.5761, 2025 10.0.26100.33650
Windows Server - addressed in versions 2022 10.0.20348.5761, 2025 10.0.26100.33650