On May 14, 2026, Microsoft disclosed CVE-2026-42897, a reported vulnerability affecting Exchange Outlook Web Access (OWA). An attacker could exploit this issue by sending a specially crafted email to...
Updated May 20, 2026
Version 13.0
Blog Post
In connection with the current mitigation, I've noticed that calling the script on a tools-only server (management) results in this error in script "Get-Mitigations.ps1". Is this a known issue?
Exception calling "LoadFrom" with "1" argument(s): "Could not load file or assembly 'file:///C:\Program Files\Microsoft\Exchange Server\V15\Bin\System.Threading.Tasks.Dataflow.dll' or one of its dependencies. The system cannot find the file specified." At C:\Program Files\Microsoft\Exchange Server\V15\scripts\Get-Mitigations.ps1:156 char:5
+ $dataFlowAssembly = [reflection.assembly]::LoadFrom($exchangeInst ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [], MethodInvocationException
+ FullyQualifiedErrorId : FileNotFoundException