Originally posted by Microsoft
Jul 6, 2022
Microsoft Lists
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Custom Formatters allow users to write declarative JSON to emit HTML. The “filepreview” elmType was introduced to show thumbnails in SharePoint document libraries with a fallback “fileType icon” for the cases when thumbnails aren’t available.
We came across a usage of this feature that allowed embedding external URLs on a SharePoint list. While we understand the powerful scenarios this could open up, we would want to make sure we permit it post due diligence and after addressing any security concerns.
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