CVE-2025-29927

Next.js Middleware Permission Bypass Vulnerability (CVE-2025-29927)
Overview Recently, NSFOCUS CERT detected that Next.js issued a security announcement and fixed the middleware permission bypass vulnerability (CVE-2025-29927). Because Next.js lacks effective verification of the source of the x-middleware-subrequest header, when ...

CVE-2025-29927 – Understanding the Next.js Middleware Vulnerability
When security vulnerabilities appear in popular frameworks, they can affect thousands of websites overnight. That’s exactly what’s happening with a newly discovered vulnerability in Next.js – one of the most... The post ...