CVE-2026-20856 | Microsoft Windows up to Server 2025 Server Update Service input validation

January 13, 2026 Yanac

A vulnerability marked as critical has been reported in Microsoft Windows. Impacted is an unknown function of the component Server Update Service. Performing a manipulation results in improper input validation.

This vulnerability is known as CVE-2026-20856. Remote exploitation of the attack is possible. No exploit is available.

It is suggested to install a patch to address this issue.VulDB Recent EntriesRead More