GHSA-gx5p-jg67-6x7h Next.js has cross-site scripting in beforeInteractive scripts with untrusted input

• npm next: >= 13.0.0, < 15.5.16 → fixed in 15.5.16 • npm next: >= 16.0.0, < 16.2.5 → fixed in 16.2.5

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.