Lemkin: Implementing custom OAuth in vibe coding creates major security leaks
Jason Lemkin · The Complete Guide to Vibe Coding without a Developer with SaaStr CEO and Founder Jason Lemkin · Sep 12, 2025 · at 30:52
SaaStr founder Jason Lemkin warns founders about the security dangers of configuring custom social logins via AI coding platforms like Replit.
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“All of these apps have their own OAuth built in. That is secure. That has been hardened. And everyone goes in and I know Replit the best because that's where I've spent time, but they all have the same ultimate. They're all more similar than they're different. And you're like, oh, I don't want to use the Replit OAuth that has their logo on it. I just want to use classic Google. I wanted people to just log in with Google or LinkedIn, like they do in all the other apps I use, right? I just want it to be effortless. So you ask them to set it up for you and they do. And it, not only does it never work, but man, this is where you get security leaks. Because they, because Claude can't get it to work and it fakes it.”
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