@nuxt/ui: UAuthForm / UForm SSR markup omits method, leaking credentials via GET if submitted before hydration

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N · score source

EPSS

No dated EPSS signal available.

As published by the source; long descriptions are shortened.

Summary UForm and UAuthForm render a server-side <form 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 <input type="password", serialised into the query string. Details src/runtime/components/Form.vue (around the template's <form element) emits: 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 <input type="password" name="password" inside a <form that has no method. Proof of concept Reported by @nimonian: 1. Create a minimal…

Published by the source

2 Jul 2026, 20:16 UTC

Last modified by the source

4 Aug 2026, 22:00 UTC

Source last checked

26 Oct 2026, 13:00 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-gj2h-2fpw-fhv9

2. Revision 2 · amended · 24 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-gj2h-2fpw-fhv9

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# Patch Next advisory brief: GHSA-gj2h-2fpw-fhv9

Advisory: @nuxt/ui: UAuthForm / UForm SSR markup omits `method`, leaking credentials via GET if submitted before hydration
IDs: GHSA-gj2h-2fpw-fhv9
Record: https://patchnext.com/advisories/ghsa-gj2h-2fpw-fhv9 (revision 3, source checked 26 Oct 2026, 13:00 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @nuxt/ui 4.8.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @nuxt/ui: affected < 4.8.1; fixed in 4.8.1

## Suggested inspection (read-only)
- `npm ls @nuxt/ui --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @nuxt/ui.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-gj2h-2fpw-fhv9 (OSV record GHSA-gj2h-2fpw-fhv9 lists affected ranges: npm @nuxt/ui >=0 <4.8.1 (fixed))
- Verified: https://github.com/advisories/GHSA-gj2h-2fpw-fhv9 (GitHub-reviewed advisory GHSA-gj2h-2fpw-fhv9 lists affected ranges: npm @nuxt/ui >=0 <4.8.1)

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