GHSA-gj2h-2fpw-fhv9 @nuxt/ui: UAuthForm / UForm SSR markup omits `method`, leaking credentials via GET if submitted before hydration

• npm @nuxt/ui: < 4.8.1 → fixed in 4.8.1

Summary `UForm` and `UAuthForm` render a server-side `` element with no `method` and no `action` attribute, relying on a hydrated `@submit.prevent` handler to intercept submission. If a user submits the form before Vue hydration has attached the handler (autofill plus Enter on a slow network, JS bundle blocked by CSP or CDN failure, etc.), the browser performs the native default: a `GET` to the current URL with every named field, including ``, serialised into the query string. Details `src/runtime/components/Form.vue` (around the template's `` element) emits: ```vue ``` No `method`, no `action`. `@submit.prevent` is the only thing stopping native submission, and it only exists after hydration. `UAuthForm` composes `UForm` and inherits the same shape. The SSR snapshot of `UAuthForm` (`test/components/__snapshots__/AuthForm.spec.ts.snap`) shows the rendered markup, with `` inside a `` that has no `method`. Proof of concept Reported by @nimonian: 1. Create a minimal Nuxt app with a `UAuthForm`. 2. Build for production and visit in a browser with network throttling at 4G or slower. 3. Enter credentials. 4. Submit (or let autofill + Enter fire before hydration). The URL becomes `/login?email=…&password=…`. Reproducible deterministically in Playwright by triggering submit immediately on `load`. Impact Any application using `UAuthForm` (or `UForm` with credential-shaped fields) as documented. The cleartext password lands in: • the address bar, • `window.history`, • the `Referer` header of every same-origin subresource fetched from the resulting URL, • access logs of any reverse proxy, CDN, or WAF that records request URLs. Patch Default the rendered `` to `method="post"` so the pre-hydration fallback submits as POST rather than GET. Vue's `@submit.prevent` still intercepts the hydrated case; the attribute only matters in the race window. Applications that explicitly want native GET submission can opt back in by passing `method="get"`. Credit Reported by @nimonian. Originally filed as `GHSA-92g7-2fpq-hmq8` against `nuxt/nuxt`; moved here because the affected code lives in `@nuxt/ui`.