A critical security flaw in Next.js middleware (CVE-2025-29927) enables attackers to bypass authentication and authorization controls by manipulating HTTP headers. Rated 9.1 CVSSv3, this vulnerability impacts applications using middleware for security checks in Next.js versions 11.1.4 through 15.2.2. Technical Breakdown of the Exploit The vulnerability stems from Next.js’ header handling, which is designed to prevent … Continue reading Severe Next.js Middleware Vulnerability Allows Unauthorized Access