CVE-2026-44581 — Next.js: Cross-site scripting in App Router applications using CSP nonces
Next.js is a React framework for building full-stack web applications. From 13.4.0 to before 15.5.16 and 16.2.5, App Router applications that rely on CSP nonces can be vulnerabl…
Published: 2026-05-13 · CVSS: 4.7 · CVSS 3.1
Next.js is a React framework for building full-stack web applications. From 13.4.0 to before 15.5.16 and 16.2.5, App Router applications that rely on CSP nonces can be vulnerable to stored cross-site scripting when deployed behind shared caches. In affected versions, malformed nonce values derived from request headers could be reflected into rendered HTML in an unsafe way, allowing an attacker to poison cached responses and cause script execution for later visitors. This vulnerability is fixed in 15.5.16 and 16.2.5.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7