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Malicious KDE theme can wipe out all your data
(www.reddit.com)
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Think of html+css, themes are supposed to be that kind of code who does nothing by itself.
Widgets aren't themes. They're things on your desktop that people are using for example for showing a folder - and if that can't interact with the system, that widget's functionality is broken.
Of course, that should not apply to install scripts or the like, which shouldn't be a thing at all really. And it should be made a lot more obvious which downloadable things can execute code / which ones are "guaranteed" safe and which ones may not be.