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Medium severity5.3OSV Advisory· Published Jul 27, 2026· Updated Jul 29, 2026

CVE-2026-64643

CVE-2026-64643

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.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
nextnpm
>= 13.0.0, < 15.5.2115.5.21
nextnpm
>= 16.0.0, < 16.2.1116.2.11

Affected products

17

Patches

Vulnerability mechanics

References

6

News mentions

2