6.3

CVE-2026-64643: vercel next.js

CVSS: 6.3v4.0MediumAnalyzed
AliasesCGA-3wm4-9pvx-4w7pCGA-5g9f-xgwv-xfpwCGA-69h6-4m45-pj7m
Published 27-07-2026Last modified 27-07-2026
Open JSON

Vulnerability summary

CVE-2026-64643 is a medium (CVSS 6.3) vulnerability in vercel next.js. EPSS estimates a 0.51% chance of exploitation in the next 30 days, higher than 42.5% of scored vulnerabilities.

Overall risk
25/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.3/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.51%
0%100%
Low · -0.01 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-4WPM-WP9R-M6GP

Timeline

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

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.

CVSS metrics

6 scores · 5 sources · 2 versions

EPSS trend

Probability

0.51%

Chance of exploitation in the next 30 days

Percentile

43%

Versus all other CVEs

30-day change

-0.01 pp

From 0.52% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.51%

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

Chainguard14 products
  • cadence-webAll versions (No fix recorded)
  • commercial-chainloop-frontendAll versions (No fix recorded)
  • homepage< 1.13.2-r9 | < 1.13.2-r8
  • jitsucom-jitsu-console< 2.11.0-r30
  • keep-ui< 0.54.2-r1
Wolfi4 products
  • jitsucom-jitsu-console< 2.11.0-r30
  • langfuse-3< 3.224.1-r0
  • langfuse-3-compat< 3.225.7-r6
  • langfuse-3-worker< 3.224.1-r0
Npm1 product
  • next≥ 13.0.0, < 15.5.21 | ≥ 16.0.0, < 16.2.11
Vercel1 product
  • next.js≥ 13.0.0, < 15.5.21 | ≥ 16.0.0, < 16.2.11

4 vendors · 20 products

References

8 links