Using third party themes or apps-does it impose security issue?

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Hi all,

im new to Shopify and the community; so apologies in advance if this is a naive question. 
while I’m starting to explore Shopify I came across various 3rd party themes that I like, for which I need to buy and then upload to Shopify. I also noticed that some apps from the App Store cause changes and modifications to the code. 
ny question; does using third party products like themes and app impose a security issue in the store website in the future? I’m a bit more detail, would it be possible for a theme or app developer to insert a code that can cause data breach or get customer information from your site store after you launch? Like would they be able to scrape and extract info from your site by simply using their theme or app?

thank you!