What is CVE-2026-44573?

CVE-2026-44573 is a high-severity vulnerability in Vercel Next.js, classified under Incorrect Authorization. CVSS score: 7.5/10. Published 2026-05-13.

How severe is CVE-2026-44573?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Vercel Next.js

CVE-2026-44573

Next.js is a React framework for building full-stack web applications. From 12.2.0 to before 15.5.16 and 16.2.5, Applications using the Pages Router with i18n configured and middleware/proxy-based authorization can allow unauthorized acces…

Vulnerability class: Broken Access Control

EPSS: 0.001 (16.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Vercel Next.js — versions >= 12.2.0, < 15.5.16, >= 16.0.0, < 16.2.5

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-44573?: CVE-2026-44573 is a high-severity vulnerability in Vercel Next.js, classified under Incorrect Authorization. CVSS score: 7.5/10. Published 2026-05-13.
How severe is CVE-2026-44573?: High severity. CVSS v3 base score is 7.5 out of 10.