What is CVE-2026-44580?

CVE-2026-44580 is a medium-severity vulnerability in Vercel Next.js, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-05-13.

How severe is CVE-2026-44580?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Vercel Next.js

CVE-2026-44580

Next.js is a React framework for building full-stack web applications. From 13.0.0 to before 15.5.16 and 16.2.5, applications that use beforeInteractive scripts together with untrusted content can be vulnerable to cross-site scripting. In…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (1.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Vercel Next.js — versions >= 13.0.0, < 15.5.16, >= 16.0.0, < 16.2.5

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

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

Frequently asked questions

What is CVE-2026-44580?: CVE-2026-44580 is a medium-severity vulnerability in Vercel Next.js, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-05-13.
How severe is CVE-2026-44580?: Medium severity. CVSS v3 base score is 6.1 out of 10.