CVE-2026-44580
Medium
Description
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 affected versions, serialized script content was not escaped safely before being embedded into the document, which could allow attacker-controlled input to break out of the intended script context and execute arbitrary JavaScript in a visitor's browser. This vulnerability is fixed in 15.5.16 and 16.2.5.
SeverityMedium
CVSS6.1
Exploit probability—
Product
Vercel Next.js
PublishedMay 13, 2026
First seenMay 13, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- vercel next.js15.5.16, 16.2.5 or later
- next15.5.16, 16.2.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| vercel next.js | 13.0.0 ≤ v < 15.5.16, 16.0.0 ≤ v < 16.2.5 | 15.5.16, 16.2.5 |
| nextnpm | 13.0.0 ≤ v < 15.5.16, 16.0.0 ≤ v < 16.2.5 | 15.5.16, 16.2.5 |
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