SEPTEMBER 14, 2026
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Case File

CVE-2026-64643

MEDIUM · CVSS 5.3 EPSS 0.52% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-07-27 · Last synced 2026-08-26

CyberRota Analysis

AI-Generated

Next.js applications utilizing App Router and Server Actions in versions 12.0.0 through 15.5.20 and 16.0.0 through 16.2.10 are vulnerable to unauthorized disclosure of Server Action IDs, potentially allowing unauthenticated users to access sensitive information. While this vulnerability primarily serves as a reconnaissance tool, it poses a heightened risk when exploited alongside other weaknesses. Developers and organizations using affected versions should prioritize upgrading to versions 15.5.21 or 16.2.11 to mitigate this risk.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-64643
Severity
MEDIUM
CVSS
5.3
EPSS
0.52%

Original NVD Description

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.

Related CVEs

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