Trending Issue: SPSE - Configuration Wizard will fail for upgrades from January 2026 CU to March 2026 CU

Customers who upgrade SharePoint Server Subscription Farms from the January 2026 CU to the March 2026 CU encounter an Invalid column name ‘SAFE_NOTIFICATION_DATA’ error when running the SharePoint Configuration Wizard. This issue affects SharePoint farms whose databases were updated to the January 2026 CU schema. Farms running an older or newer database schema are not […]

To enhance security a new Exploit Protection Setting was added to Windows when installing September 2025 CU for SharePoint Server Subscription Edition. This setting works as expected on Windows Server 2022 but caused the SharePoint Administration Service to fail on Windows Server 2025. Reference Trending Issue: SPAdminV4 fails to start on Windows Server 2025 after […]

September 2025 CU for SharePoint Server Subscription Edition included an security enhancement for the encryption algorithm used by the secure store service to save credentials. As a side effect credentials stored with the old algorithm could no longer be decrypted. When trying to edit an existing target application or when trying to add/update credentials the […]

Important: If your current farm patch level is September 2025 CU, remove the NT Authority\system account from WSS_WPG and IIS_IUSRS local security groups of the SharePoint machines – otherwise installing the SharePoint fixes will fail. For more details check this article: Trending Issue: SharePoint fixes fail to install after installation of September 2025 CU Below […]

Important: If your current farm patch level is September 2025 CU, remove the NT Authority\system account from WSS_WPG and IIS_IUSRS local security groups of the SharePoint machines – otherwise installing the SharePoint fixes will fail. For more details check this article: Trending Issue: SharePoint fixes fail to install after installation of September 2025 CU The […]

Important: If your current farm patch level is September 2025 CU, remove the NT Authority\system account from WSS_WPG and IIS_IUSRS local security groups of the SharePoint machines – otherwise installing the SharePoint fixes will fail. For more details check this article: Trending Issue: SharePoint fixes fail to install after installation of September 2025 CU The […]

A race condition in SharePoint Server can lead to application pool worker process crashes with a combination of the following Exception codes 0xC06D007E and 0xE0434352: Faulting application name: w3wp.exe, version: 10.0.20348.1, time stamp: 0xcfdb13d8 Faulting module name: KERNELBASE.dll, version: 10.0.20348.4294, time stamp: 0x689cd397 Exception code: 0xc06d007e Fault offset: 0x0000000000041b39 Faulting process id: 0x32fc Faulting application […]

After September 2025 CU for SharePoint Server Subscription Edition application pool worker process might crash with Exception code 0xC0000409. Event log will contain entries similar to this: Faulting application name: w3wp.exe, version: 10.0.17763.1, time stamp: 0xcfdb13d8 Faulting module name: owssvr.dll, version: 16.0.19127.20100, time stamp: 0x689cd397 Exception code: 0xc0000409 Fault offset: 0x000000000033b39b Faulting process id: 0x32fc […]

To enhance security a new Exploit Protection Setting was added to Windows when installing September 2025 CU. This adds several protections to OWSTIMER.EXE including an option that prevents creating child processes. SharePoint 2010 workflows require the workflow definition to be compiled using the CSC.EXE compiler – and this fails due to this Exploit Protection setting. […]