basePath not working for forgot password form

[xavierchow]

Describe the Bug

When the basePath (in my case it's /cms) is set, the forgot password form action url is still the default one /api/users/forgot-password without the prefix, which cause a 500 error when submitting the form.

⨯ Error: Failed to find Server Action. This request might be from an older or newer deployment.
Read more: https://nextjs.org/docs/messages/failed-to-find-server-action
    at ignore-listed frames
⨯ Error: Failed to find Server Action. This request might be from an older or newer deployment.
Read more: https://nextjs.org/docs/messages/failed-to-find-server-action
    at ignore-listed frames
 POST /api/users/forgot-password 500 in 1879ms (next.js: 1807ms, application-code: 72ms)

It's worth mentioning the login form is correct with basePath included.

Link to the code that reproduces this issue

https://github.com/xavierchow/payload-forgot-pwd-form-issue

Reproduction Steps

1. npx create-payload-app
2. add basePath /cms to the next.config.ts
3. pnpm dev
4. create the first user and logout
5. go to the login page and click the forgot password link
6. submit any email in the forgot password form
7. server returns 500 error

Which area(s) are affected?

Not sure

Environment Info

Binaries:
  Node: 24.11.1
  npm: 11.6.2
  Yarn: 1.22.22
  pnpm: 10.27.0
Relevant Packages:
  payload: 3.80.0
  next: 16.2.1
  @payloadcms/db-sqlite: 3.80.0
  @payloadcms/drizzle: 3.80.0
  @payloadcms/graphql: 3.80.0
  @payloadcms/next/utilities: 3.80.0
  @payloadcms/richtext-lexical: 3.80.0
  @payloadcms/translations: 3.80.0
  @payloadcms/ui/shared: 3.80.0
  react: 19.2.4
  react-dom: 19.2.4
Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 24.3.0: Thu Jan  2 20:24:24 PST 2025; root:xnu-11215.81.4~3/RELEASE_ARM64_T6030
  Available memory (MB): 18432
  Available CPU cores: 11

[xavierchow]

ok, it seems the actions is constructed without considering the basePath.

payload/packages/next/src/views/ForgotPassword/ForgotPasswordForm/index.tsx

Lines 67 to 72 in 8045887

	<Form
	action={`${api}/${userSlug}/forgot-password`}
	handleResponse={handleResponse}
	initialState={initialState}
	method="POST"
	>

I think it should be using the formatAdminURL function introduced by this commit,
fa6b503#diff-f2e7c9ea74864734b83a13ebc8ed728dc929d8647da5ad191ed803e93e0d2ce5