fix(auth): validate invitation magic link tokens

Accept invitation links across configured public origins while still
rejecting stored invitations whose token no longer matches.

app/Http/Controllers/Controller.php

@@ -98,7 +98,7 @@ class Controller extends BaseController
     public function link()
     {
         $token = request()->get('token');
-        if ($token) {
+        if (is_string($token) && $token !== '') {
             try {
                 $decrypted = Crypt::decryptString($token);
             } catch (DecryptException) {
@@ -126,9 +126,8 @@ class Controller extends BaseController
             $invitation = TeamInvitation::query()
                 ->where('email', $email)
                 ->when($invitationUuid, fn ($query) => $query->where('uuid', $invitationUuid))
-                ->where('link', request()->fullUrl())
                 ->first();
-            if (! $invitation || ! $invitation->isValid()) {
+            if (! $invitation || ! $this->invitationLinkMatchesToken($invitation, $token) || ! $invitation->isValid()) {
                 return redirect()->route('login')->with('error', 'Invitation has expired or been revoked.');
             }
 
@@ -152,6 +151,19 @@ class Controller extends BaseController
         return redirect()->route('login')->with('error', 'Invalid credentials.');
     }
 
+    private function invitationLinkMatchesToken(TeamInvitation $invitation, string $token): bool
+    {
+        $query = parse_url($invitation->link, PHP_URL_QUERY);
+        if (! is_string($query)) {
+            return false;
+        }
+
+        parse_str($query, $parameters);
+        $storedToken = $parameters['token'] ?? null;
+
+        return is_string($storedToken) && hash_equals($storedToken, $token);
+    }
+
     public function showInvitation()
     {
         $invitationUuid = request()->route('uuid');

app/Livewire/Team/InviteLink.php

@@ -40,6 +40,16 @@ class InviteLink extends Component
         $this->generateInviteLink(sendEmail: false);
     }
 
+    private function invitationUrl(string $routeName, array $parameters): string
+    {
+        $fqdn = instanceSettings()->fqdn;
+        if (filled($fqdn)) {
+            return rtrim($fqdn, '/').route($routeName, $parameters, false);
+        }
+
+        return route($routeName, $parameters);
+    }
+
     private function generateInviteLink(bool $sendEmail = false)
     {
         try {
@@ -62,7 +72,7 @@ class InviteLink extends Component
                 return handleError(livewire: $this, customErrorMessage: "$this->email is already a member of ".currentTeam()->name.'.');
             }
             $uuid = (string) new Cuid2(32);
-            $link = url('/').config('constants.invitation.link.base_url').$uuid;
+            $link = $this->invitationUrl('team.invitation.show', ['uuid' => $uuid]);
             $user = User::whereEmail($this->email)->first();
 
             if (is_null($user)) {
@@ -74,7 +84,7 @@ class InviteLink extends Component
                     'force_password_reset' => true,
                 ]);
                 $token = Crypt::encryptString("{$user->email}@@@{$uuid}@@@{$password}");
-                $link = route('auth.link', ['token' => $token]);
+                $link = $this->invitationUrl('auth.link', ['token' => $token]);
             }
             $invitation = TeamInvitation::whereEmail($this->email)->first();
             if (! is_null($invitation)) {

config/constants.php

@@ -86,7 +86,6 @@ return [
 
     'invitation' => [
         'link' => [
-            'base_url' => '/invitations/',
             'expiration_days' => 3,
         ],
     ],

tests/Feature/InvitationLinkHandlingTest.php

@@ -77,6 +77,34 @@ it('accepts a valid magic link invitation only once and rotates the temporary pa
     $this->assertGuest();
 });
 
+it('accepts a magic link when opened from a different public origin', function () {
+    [$team, $user, $password, $token] = createInvitationLinkFixture();
+
+    $this->get('https://coolify.example.com/auth/link?token='.urlencode($token))
+        ->assertRedirect(route('dashboard'));
+
+    $this->assertAuthenticatedAs($user);
+    $this->assertDatabaseMissing('team_invitations', ['email' => $user->email]);
+    expect($user->teams()->where('team_id', $team->id)->exists())->toBeTrue();
+
+    $user->refresh();
+    expect(Hash::check($password, $user->password))->toBeFalse();
+});
+
+it('rejects a magic link when the stored invitation token differs', function () {
+    [, $user, , $token, $invitation] = createInvitationLinkFixture();
+    $differentToken = Crypt::encryptString("{$user->email}@@@{$invitation->uuid}@@@different-password");
+
+    $invitation->forceFill([
+        'link' => route('auth.link', ['token' => $differentToken]),
+    ])->save();
+
+    $this->get(route('auth.link', ['token' => $token]))
+        ->assertRedirect(route('login'));
+
+    $this->assertGuest();
+});
+
 it('rejects a magic link when the invitation was revoked', function () {
     [, $user, , $token, $invitation] = createInvitationLinkFixture();
     $invitation->delete();

tests/Feature/TeamInvitationPrivilegeEscalationTest.php

@@ -1,7 +1,9 @@
 <?php
 
 use App\Livewire\Team\InviteLink;
+use App\Models\InstanceSettings;
 use App\Models\Team;
+use App\Models\TeamInvitation;
 use App\Models\User;
 use Illuminate\Foundation\Testing\RefreshDatabase;
 use Livewire\Livewire;
@@ -9,6 +11,8 @@ use Livewire\Livewire;
 uses(RefreshDatabase::class);
 
 beforeEach(function () {
+    InstanceSettings::unguarded(fn () => InstanceSettings::query()->updateOrCreate(['id' => 0], ['fqdn' => null]));
+
     // Create a team with owner, admin, and member
     $this->team = Team::factory()->create();
 
@@ -161,6 +165,46 @@ describe('privilege escalation prevention', function () {
         ]);
     });
 
+    test('new user invitation magic link uses instance fqdn when configured', function () {
+        InstanceSettings::unguarded(fn () => InstanceSettings::query()->updateOrCreate(
+            ['id' => 0],
+            ['fqdn' => 'https://coolify.example.com']
+        ));
+
+        $this->actingAs($this->owner);
+        session(['currentTeam' => $this->team]);
+
+        Livewire::test(InviteLink::class)
+            ->set('email', 'fqdn-invitee@example.com')
+            ->set('role', 'member')
+            ->call('viaLink')
+            ->assertDispatched('success');
+
+        $invitation = TeamInvitation::whereEmail('fqdn-invitee@example.com')->firstOrFail();
+
+        expect($invitation->link)->toStartWith('https://coolify.example.com/auth/link?token=');
+    });
+
+    test('new user invitation magic link falls back to route url when instance fqdn is not configured', function () {
+        InstanceSettings::unguarded(fn () => InstanceSettings::query()->updateOrCreate(
+            ['id' => 0],
+            ['fqdn' => null]
+        ));
+
+        $this->actingAs($this->owner);
+        session(['currentTeam' => $this->team]);
+
+        Livewire::test(InviteLink::class)
+            ->set('email', 'fallback-invitee@example.com')
+            ->set('role', 'member')
+            ->call('viaLink')
+            ->assertDispatched('success');
+
+        $invitation = TeamInvitation::whereEmail('fallback-invitee@example.com')->firstOrFail();
+
+        expect($invitation->link)->toStartWith('http://localhost/auth/link?token=');
+    });
+
     test('member cannot bypass policy by calling viaEmail', function () {
         // Login as member
         $this->actingAs($this->member);