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CVE-2026-64643

Next.js: Unauthenticated Disclosure of Internal Server Function endpoints

Published: Jul 27, 2026Updated: Jul 29, 2026 Sources: CVE List NVDCWE-201
5.3MEDIUM
NVD MITRE
EPSS Score
0.5%
Top 58.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-201

Affected Products

vercel
commercial·US
next.jsLibraryLibrary
OSS Libraries / web-framework

Exploitability

Official Patch Available
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References

https://github.com/vercel/next.js/security/advisories/GHSA-955p-x3mx-jcvp
github.com
https://github.com/vercel/next.js/commit/1b0c3ae912a3ad925c60065cc8d55b070fa8bcd3
github.com
https://github.com/vercel/next.js/commit/ff12a6124e1504f17b62de948b8a553fdecaef7b
github.com
and 2 more references View all →

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