The recent release of .NET security patches to address CVE-2018-8421 is causing SharePoint workflows to stop working. Our SharePoint and network teams have successfully remedied the issue using the following fixes.
After installing, patch KB4457916/4457035 or Microsoft KB4457920 rollup, we’re seeing SharePoint 2010 and 2013 server workflows to fail on start.
We have successfully applied this Microsoft supplied PowerShell script with customers to remediate the workflow failures. This needs to be performed on only one server in a farm and will automatically perform an IIS Reset.
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