8.3

CVE-2026-64642: vercel next.js Improper Authorization

CVSS: 8.3v4.0HighAnalyzed
AliasesCGA-6fjc-gvp8-cxv5CGA-8239-gcv7-p8hjCGA-9gh2-3jm9-c488
Published 27-07-2026Last modified 28-07-2026
Open JSON

Vulnerability summary

CVE-2026-64642 is a high (CVSS 8.3) Improper Authorization vulnerability in vercel next.js. EPSS estimates a 0.64% chance of exploitation in the next 30 days, higher than 49.7% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.3/10
010
High · v4.0 (CVE.org)
EPSS score
0.64%
0%100%
Low · -0.53 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-2J5C-C45P-994C

Timeline

  1. 27-07-2026
    PublishedVulnerability first disclosed.
  2. 28-07-2026
    Last modifiedVulnerability information updated.

Description

Next.js is a React framework for building full-stack web applications. In versions 16.0.0 through 16.2.10, crafted requests targeting Next.js applications using App Router built with Turbopack and a single entry in config.i18n.locales can bypass middleware/proxy based authentication. This issue has been fixed in version 16.2.11.

CVSS metrics

6 scores · 5 sources · 2 versions

EPSS trend

Probability

0.64%

Chance of exploitation in the next 30 days

Percentile

50%

Versus all other CVEs

30-day change

-0.53 pp

From 1.16% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.64%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard8 products
  • commercial-chainloop-frontendAll versions (No fix recorded)
  • homepage< 1.13.2-r9 | < 1.13.2-r8
  • langfuse-3< 3.224.1-r0
  • langfuse-3-compat< 3.225.7-r6
  • langfuse-3-worker< 3.224.1-r0
Wolfi3 products
  • langfuse-3< 3.224.1-r0
  • langfuse-3-compat< 3.225.7-r6
  • langfuse-3-worker< 3.224.1-r0
Npm1 product
  • next≥ 16.0.0, < 16.2.11
Vercel1 product

4 vendors · 13 products

References

7 links