SharePoint Workflows go belly-up when you install the September .Net Security Only patch

Another major bug in this month’s patches, officially acknowledged, affects the Security Only .Net patch KB 4457916, for Win8.1 and Server 2012 R2. Install that patch and any defined Sharepoint Workflows will fail to run.

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‘Softie Rodney Viana has posted details and a workaround for the “System.CodeDom.CodeBinaryOperatorExpression is not marked as authorized” bug.

Apparently, installing last Tuesday’s KB 4457916 Security Only updates for .Net Framework 3.5, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, and 4.7.2 for Windows 8.1 and Server 2012 R2 causes a hard stop with any SharePoint Workflows. (Workflows are set up by an admin to handle the flow of documents through a series of steps.)

The net result: A hard hiccup anytime a document enters a Workflow.

The solution, per Viana, is to manually enter an <authorizedType> tag in the .Net config file.

At this point I haven’t seen the error appear with other variations of the CVE-2018-8421 .NET Framework Remote Code Execution Vulnerability patch, but "Week B" just fell into the Recycle Bin and "Week C" looms.

Of course, there’s no warning about the error in the KB article.

Thx @columbia2011

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