AIKIDO-2026-865660

TL;DR

SvelteKit serves experimental remote function query responses from the server without any cache-control headers. Because these responses can contain personalized, user-specific data, a shared cache such as a CDN or reverse proxy can store one user's response and later serve it to other users. This exposes sensitive personalized data across users. The fix sends cache-control: private, no-store on remote function responses, except during prerendering, so shared caches never store them.