Cross-site scripting in Next.js - CVE-2026-44580
Published: May 6, 2026
Vulnerability identifier: #VU130275
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-44580
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary JavaScript in a visitor's browser.
The vulnerability exists due to improper neutralization of input during web page generation in beforeInteractive script content serialization when embedding untrusted content into the document. A remote attacker can supply specially crafted input to execute arbitrary JavaScript in a visitor's browser.
User interaction is required to load the affected page.
Affected software
Next.js
How to mitigate CVE-2026-44580
Install security update from vendor's website.
Next.js - addressed in versions 15.5.16, 16.2.5