CVE-2026-20839 | Microsoft Windows up to Server 2025 Client-Side Caching access control

January 13, 2026 Yanac

A vulnerability classified as problematic has been found in Microsoft Windows. This issue affects some unknown processing of the component Client-Side Caching. Performing a manipulation results in improper access controls.

This vulnerability was named CVE-2026-20839. The attack needs to be approached locally. There is no available exploit.

Applying a patch is the recommended action to fix this issue.VulDB Recent EntriesRead More