How This Next.js Bug Could EXPOSE Your App

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Imagine getting hacked because of a single HTTP header you didn’t even know existed. That’s what happened with the infamous x-middleware-subrequest flaw in Next.js. In this video, we break down how a tiny trust issue in middleware led to a critical CVSS 9.1 vulnerability that let attackers bypass authentication like they owned the place. We explain what went wrong, how Vercel fixed it, and how you can protect your own app—even if you’re still stuck on legacy code because your tech lead says “we’ll migrate next quarter” every quarter.

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