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TI-2026-46204 Aliases CVE-2026-64643GHSA-955p-x3mx-jcvp

Next.js: Unauthenticated Disclosure of Internal Server Function endpoints

Priority LOW 35CWE-201Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Partial Red Hat: 8 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-201.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0051 43rd percentileScored 2026-11-07
Fix Partial next.js (vercel): 15.5.21, 16.2.11next (npm): 15.5.21, 16.2.11Red Hat: 8 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
vercelnext.js13.0.0 to before 15.5.21; 16.0.0 to before 16.2.1115.5.21, 16.2.11Patch availableCNA
—next (npm)13.0.0 to before 15.5.2115.5.21Patch availableGHSA-955p-x3mx-jcvp
—next (npm)16.0.0 to before 16.2.1116.2.11Patch availableGHSA-955p-x3mx-jcvp
  • next.js Vendorvercel Affected 13.0.0 to before 15.5.21; 16.0.0 to before 16.2.11 Fixed in 15.5.21, 16.2.11 Patch available CNA
  • next (npm) Vendor— Affected 13.0.0 to before 15.5.21 Fixed in 15.5.21 Patch available GHSA-955p-x3mx-jcvp
  • next (npm) Vendor— Affected 16.0.0 to before 16.2.11 Fixed in 16.2.11 Patch available GHSA-955p-x3mx-jcvp

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:*13.0.0 to before 15.5.21; 16.0.0 to before 16.2.11Vulnerablevercel
  • cpe:2.3:a:vercel:next.js:*:*:*:*:*:node.js:*:* Versions 13.0.0 to before 15.5.21; 16.0.0 to before 16.2.11 Vulnerable ·vercel

Remediation

  • Fix · CNA next.js (vercel) Fixed in 15.5.21, 16.2.11
  • Fix · GHSA-955p-x3mx-jcvp next (npm) Fixed in 15.5.21 Advisory →
  • Fix · GHSA-955p-x3mx-jcvp next (npm) Fixed in 16.2.11 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 7AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux AI (RHEL AI) 3AffectedNo fix yet: Fix deferred
Red Hat Trusted Artifact SignerAffectedNo fix yet: Fix deferred
streams for Apache Kafka 2AffectedNo fix yet: Fix deferred
streams for Apache Kafka 3AffectedNo fix yet: Fix deferred

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-64643
  2. 2026-10-03 Alias added: GHSA-955p-x3mx-jcvp
  3. 2026-10-16 Affected versions changed · Red Hat

References

Patch 2

Advisory 1

Other 3

  • TI-2025-34861 Deserialization of untrusted data in Meta react-server-dom-webpack KEVCVSS 3.1CRITICAL 10.0
  • TI-2025-21309 Authorization Bypass in Next.js Middleware CVSS 3.1CRITICAL 9.1
  • TI-2025-34863 Deserialization of untrusted data in Meta react-server-dom-webpack CVSS 3.1HIGH 7.5
  • TI-2024-31371 Cache Poisoning in next.js CVSS 3.1HIGH 7.5
  • TI-2023-24914 Next.js before 13.4.20-canary.13 lacks a cache-control header and thus empty prefetch… CVSS 3.1HIGH 7.5
  • TI-2026-32490 Next.js: Server-side request forgery in applications using WebSocket upgrades CVSS 3.1HIGH 8.6
See all 62 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences