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 […]

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. […]