GHSA-gx5p-jg67-6x7h

Next.js has cross-site scripting in beforeInteractive scripts with untrusted input

At a glance

Published
Updated
CVE
CVE-2026-44580
CVSS_V3
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Description

### Impact 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. ### Fix We now HTML-escape serialized `beforeInteractive` script content before embedding it into the page, preventing attacker-controlled content from breaking out of the inline script boundary. ### Workarounds If you cannot upgrade immediately, do not pass untrusted data into `beforeInteractive` scripts. If that pattern is unavoidable, sanitize or escape the content before embedding it.

Affected packages

PackageVersions
npm · nextintroduced 13.0.0, fixed 15.5.16
npm · nextintroduced 16.0.0, fixed 16.2.5

References

Sources

SourceLicence
OSV.devCC-BY 4.0 — GitHub Advisory Database