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CVE-2026-64643

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 6.3 · Medium · EPSS 0.5% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • next.js

    Versions
    • >= 13.0.0, < 15.5.21: Affected
    • >= 16.0.0, < 16.2.11: Affected

    No fix published

  • next npm

    Affected ranges
    • SEMVER: ≥ 13.0.0, < 15.5.21

    Update to 15.5.21

  • next npm

    Affected ranges
    • SEMVER: ≥ 16.0.0, < 16.2.11

    Update to 16.2.11

Original sources

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