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What are the security risks, if any, of making an app closed-source vs. open-source?

  • it's secure if written securely, regardless of it being open source - there is a big difference between something being true, and being able to prove that it is true. Just because you can't prove it is true does not mean that it is not true. – schroeder Sep 12 '16 at 20:30
  • if, on the other hand, your question is really about an acceptable risk of closed source, then that's another question altogether – schroeder Sep 12 '16 at 20:31
  • Closed-source is less attacked than open-source primarily because OS gives attackers a map while CS involves a lot of guess work. – IMB Sep 12 '16 at 20:49
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    @IMB Citation needed. – user Sep 12 '16 at 20:56
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    @IMB Well, that's because WordPress is widely used enough and poorly designed enough that automated bots crawl the web looking for known vulnerabilities. There are similar bots for some closed-source CMS's and pure-custom sites can be exploited via target attacks too. – Alexander O'Mara Sep 12 '16 at 21:25