CVE-2026-64643Next.js: Unauthenticated Disclosure of Internal Server Function endpoints

Descripción

Next.js is a React framework for building full-stack web applications. In versions 12.0.0 through 15.5.20 and 16.0.0 through 16.2.10, Next.js applications using App Router, Server Actions (use server) or use cache endpoints can be disclosed bypassing any authentication on the pages where these endpoints are usually used. Server Action IDs can be disclosed to unauthenticated users via publicly served client artifacts (for example, static chunks containing action references). Affected users are applications using App Router and Server Actions. By itself, this disclosure is typically a recon/enumeration primitive; however, it can increase risk when combined with other weaknesses. This issue has been fixed in versions 15.5.21 and 16.2.11.

Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.

Productos y versiones afectados

Referencias y parches

• https://github.com/vercel/next.js/security/advisories/GHSA-955p-x3mx-jcvp Vendor Advisory
• https://github.com/vercel/next.js/commit/1b0c3ae912a3ad925c60065cc8d55b070fa8bcd3 Patch
• https://github.com/vercel/next.js/commit/ff12a6124e1504f17b62de948b8a553fdecaef7b Patch
• https://github.com/vercel/next.js/releases/tag/v15.5.21 ProductRelease Notes
• https://github.com/vercel/next.js/releases/tag/v16.2.11 ProductRelease Notes