KB5122882: Overview with user sentiment and feedback

Overview

KB5122882 is a cumulative security update for Windows Server 2022 released on September 8, 2026 (OS Build 20348.5622). This update includes the latest security fixes, quality improvements, and non-security updates from the previous month's optional preview release. The update addresses vulnerabilities and includes enhancements across multiple system components including certificates, networking, Hyper-V, and Remote Desktop functionality.

General Purpose

• Certificate Compatibility: Improves application compatibility during Windows certificate-authority updates to ensure applications continue functioning as Microsoft transitions to newer signing certificates
• Time Zone Adjustment: Updates Morocco Standard Time to reflect the country's transition to permanent UTC+00:00 effective September 20, 2026
• Hyper-V Stability: Addresses an issue causing limited Windows Server 2022 virtual machines to intermittently encounter stop error 0x139 resulting in unexpected restarts
• Network Failover Improvement: Enhances network failover on Windows Server systems to help connections respond more quickly when a network adapter is disconnected
• Remote Desktop Audio: Improves Remote Desktop audio redirection to ensure audio from remote sessions plays correctly on local devices
• Security Updates: Contains cumulative security fixes from the previous month's releases

General Sentiment

This update addresses critical functionality issues, particularly for Remote Desktop Services which experienced significant problems post-deployment. While the update includes important security and stability fixes, it introduced a known issue affecting RDS that caused connection failures and system hangs. However, Microsoft released a follow-up update (KB5129237) on September 14, 2026 that resolves the RDS issue, indicating responsive issue management. The update is generally stable for systems that install the subsequent patch or avoid the specific RDS scenario.

Known Issues

• Remote Desktop Services might stop responding after September 2026 security update: RDS may become unstable with RDP connections failing after several minutes, sign-in issues, or servers hanging at "Please wait for the Remote Desktop Configuration". MMC, RDS Licensing Diagnoser, File Explorer, and Windows Update page may also become unresponsive. (Resolved in KB5129237 released September 14, 2026)
• Windows Server Update Services (WSUS) does not display error details after installing KB5070884 or later updates: Synchronization error details are not displayed within error reporting due to a temporary removal to address CVE-2025-59287

Disclaimer: We take measures to ensure that AI-generated content is of the highest possible quality, but we cannot guarantee its accuracy and recommend that users do their own independent research. Generated on 2026-10-01 01:26 AM

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