The Unexpected Security with Next.js 15 and Remix 3: Insights Next.js 15 and Remix 3 represent major leaps for React-based full-stack development, but their security models include several underdiscussed, unexpected changes that developers need to know. From shifted default protections to hidden risks in new features, these frameworks challenge long-held assumptions about full-stack security. Unexpected Security Upgrades in Next.js 15 Next.js 15’s most talked-about features focus on performance and developer experience, but its security updates are equally impactful—and often overlooked. A key unexpected change is the strict default Content Security Policy (CSP) for server-rendered routes, which blocks inline scripts and unauthorized resource loads out of the box, a shift from previous versions that required manual CSP configuration.…