Microsoft Windows Server 2025 Update Version OS Build 26100.33296
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Update Summary
KB5120233 for Windows Server 2025 (OS Build 26100.33296) includes the latest security fixes, non-security improvements from KB5099536, and a servicing stack update KB5120232. It also improves File Explorer, PQC certificate support, Secure Boot certificate deployment, and the emoji panel. Reference IDs: KB5070881, CVE-2025-59287.
Update Details
Security
- Includes the latest security fixes for Windows Server 2025.
- Improves support for post-quantum cryptography (PQC) certificates by restoring PQC options during Certificate Authority configuration and enabling successful enrollment with newly created PQC certificate templates.
- Adds high-confidence device targeting data to expand automatic deployment of new Secure Boot certificates.
- Known issue note: WSUS synchronization error details are temporarily removed to address
CVE-2025-59287.
Bug Fixes
- Improves File Explorer behavior for files on DFS mapped drives so previews and copied files work after reconnecting to the network.
- Fixes PQC certificate enrollment and Certificate Authority configuration issues.
- Improves Secure Boot certificate targeting coverage for eligible devices.
- Adds GIPHY support to the emoji panel after the deprecation of Google's Tenor API.
New Features
- The emoji panel now supports GIPHY.
Known Issues
- After installing KB5070881 or later updates, WSUS does not display synchronization error details in error reporting.
Hints
- If previous updates are already installed, only the new updates in this package will be downloaded and installed.
- Windows Server Update Services (WSUS) error details are temporarily unavailable in synchronization error reporting.
- Secure Boot certificates used by most Windows devices are set to expire starting in June 2026; updated certificates continue to be delivered through Windows Update.
Product Information
Vendor: Microsoft
Product: Windows Server 2025
Product type: Software
Application category: Utilities
Platform: Windows
Version: OS Build 26100.33296
Vendor information published: Aug 11, 2026
Original release notes: View on vendor site
Published on updatealert.io: Aug 12, 2026
Description: Server operating system for next-generation on-premises and hybrid workloads.