diff --git a/app/Livewire/Project/New/GithubPrivateRepositoryDeployKey.php b/app/Livewire/Project/New/GithubPrivateRepositoryDeployKey.php
index 98c5395bfd..6946d9a687 100644
--- a/app/Livewire/Project/New/GithubPrivateRepositoryDeployKey.php
+++ b/app/Livewire/Project/New/GithubPrivateRepositoryDeployKey.php
@@ -125,7 +125,10 @@ class GithubPrivateRepositoryDeployKey extends Component
 
     public function setPrivateKey($private_key_id)
     {
-        $this->private_key_id = $private_key_id;
+        $this->authorize('create', Application::class);
+
+        $privateKey = PrivateKey::ownedByCurrentTeam()->findOrFail($private_key_id);
+        $this->private_key_id = $privateKey->id;
         $this->current_step = 'repository';
     }
 
@@ -133,6 +136,8 @@ class GithubPrivateRepositoryDeployKey extends Component
     {
         $this->authorize('create', Application::class);
 
+        $privateKey = PrivateKey::ownedByCurrentTeam()->findOrFail($this->private_key_id);
+
         $this->validate();
         try {
             $destination_uuid = $this->query['destination'] ?? null;
@@ -160,7 +165,7 @@ class GithubPrivateRepositoryDeployKey extends Component
                     'environment_id' => $environment->id,
                     'destination_id' => $destination->id,
                     'destination_type' => $destination_class,
-                    'private_key_id' => $this->private_key_id,
+                    'private_key_id' => $privateKey->id,
                 ];
             } else {
                 $application_init = [
@@ -173,7 +178,7 @@ class GithubPrivateRepositoryDeployKey extends Component
                     'environment_id' => $environment->id,
                     'destination_id' => $destination->id,
                     'destination_type' => $destination_class,
-                    'private_key_id' => $this->private_key_id,
+                    'private_key_id' => $privateKey->id,
                     'source_id' => $this->git_source->id,
                     'source_type' => $this->git_source->getMorphClass(),
                 ];
diff --git a/tests/Feature/Authorization/DeployKeyApplicationCreationAuthorizationTest.php b/tests/Feature/Authorization/DeployKeyApplicationCreationAuthorizationTest.php
new file mode 100644
index 0000000000..62cf02ef3b
--- /dev/null
+++ b/tests/Feature/Authorization/DeployKeyApplicationCreationAuthorizationTest.php
@@ -0,0 +1,156 @@
+<?php
+
+use App\Livewire\Project\New\GithubPrivateRepositoryDeployKey;
+use App\Models\Application;
+use App\Models\Environment;
+use App\Models\InstanceSettings;
+use App\Models\PrivateKey;
+use App\Models\Project;
+use App\Models\Server;
+use App\Models\StandaloneDocker;
+use App\Models\Team;
+use App\Models\User;
+use Illuminate\Auth\Access\AuthorizationException;
+use Illuminate\Database\Eloquent\ModelNotFoundException;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\Storage;
+use Illuminate\Support\Str;
+use Livewire\Features\SupportTesting\Testable;
+use Livewire\Livewire;
+
+uses(RefreshDatabase::class);
+
+beforeEach(function () {
+    Storage::fake('ssh-keys');
+    InstanceSettings::query()->forceCreate(['id' => 0]);
+
+    $this->rootTeam = Team::query()->forceCreate(['id' => 0, 'name' => 'Root Team']);
+    $this->team = Team::factory()->create();
+    $this->otherTeam = Team::factory()->create();
+    $this->admin = User::factory()->create();
+    $this->member = User::factory()->create();
+    $this->team->members()->attach($this->admin, ['role' => 'admin']);
+    $this->team->members()->attach($this->member, ['role' => 'member']);
+
+    $this->privateKey = PrivateKey::withoutEvents(fn () => PrivateKey::factory()->create(['uuid' => (string) Str::uuid(), 'team_id' => $this->team->id]));
+    $this->otherPrivateKey = PrivateKey::withoutEvents(fn () => PrivateKey::factory()->create(['uuid' => (string) Str::uuid(), 'team_id' => $this->otherTeam->id]));
+    $this->rootPrivateKey = PrivateKey::withoutEvents(fn () => PrivateKey::factory()->create(['uuid' => (string) Str::uuid(), 'team_id' => 0]));
+    $this->server = Server::factory()->create(['team_id' => $this->team->id]);
+    $this->destination = StandaloneDocker::query()->where('server_id', $this->server->id)->firstOrFail();
+    $this->project = Project::factory()->create(['team_id' => $this->team->id]);
+    $this->environment = Environment::factory()->create(['project_id' => $this->project->id]);
+});
+
+function actAsDeployKeyUser(User $user, Team $team): void
+{
+    test()->actingAs($user);
+    session(['currentTeam' => $team]);
+}
+
+function deployKeyComponent(): Testable
+{
+    return Livewire::test(GithubPrivateRepositoryDeployKey::class, ['type' => 'private-deploy-key'])
+        ->set('parameters', [
+            'project_uuid' => test()->project->uuid,
+            'environment_uuid' => test()->environment->uuid,
+        ])
+        ->set('query', ['destination' => test()->destination->uuid]);
+}
+
+function deployKeyApiPayload(PrivateKey $privateKey): array
+{
+    return [
+        'project_uuid' => test()->project->uuid,
+        'environment_uuid' => test()->environment->uuid,
+        'server_uuid' => test()->server->uuid,
+        'private_key_uuid' => $privateKey->uuid,
+        'git_repository' => 'git@attacker.example:owner/repository.git',
+        'git_branch' => 'main',
+        'build_pack' => 'nixpacks',
+        'ports_exposes' => '3000',
+        'autogenerate_domain' => false,
+    ];
+}
+
+test('admin can select and create an application with a key owned by the current team', function () {
+    actAsDeployKeyUser($this->admin, $this->team);
+
+    deployKeyComponent()
+        ->call('setPrivateKey', $this->privateKey->id)
+        ->assertSet('private_key_id', $this->privateKey->id)
+        ->set('repository_url', 'git@example.com:owner/repository.git')
+        ->set('branch', 'main')
+        ->call('submit');
+
+    expect(Application::query()->sole()->private_key_id)->toBe($this->privateKey->id);
+});
+
+test('member cannot invoke the deploy key selection action directly', function () {
+    actAsDeployKeyUser($this->member, $this->team);
+    $this->withoutExceptionHandling();
+
+    expect(fn () => deployKeyComponent()->call('setPrivateKey', $this->privateKey->id))
+        ->toThrow(AuthorizationException::class);
+
+    expect(Application::query()->count())->toBe(0);
+});
+
+test('deploy key selection rejects foreign ids uuids missing ids and root team keys', function (mixed $key): void {
+    actAsDeployKeyUser($this->admin, $this->team);
+
+    expect(fn () => deployKeyComponent()->call('setPrivateKey', value($key)))
+        ->toThrow(ModelNotFoundException::class);
+
+    expect(Application::query()->count())->toBe(0);
+})->with([
+    'another team id' => fn () => test()->otherPrivateKey->id,
+    'another team uuid' => fn () => test()->otherPrivateKey->uuid,
+    'missing id' => 999999,
+    'missing uuid' => '00000000-0000-0000-0000-000000000000',
+    'root team key' => fn () => test()->rootPrivateKey->id,
+]);
+
+test('submit rejects a foreign key injected through hydrated component state without side effects', function () {
+    actAsDeployKeyUser($this->admin, $this->team);
+
+    expect(fn () => deployKeyComponent()
+        ->set('private_key_id', $this->otherPrivateKey->id)
+        ->set('repository_url', 'git@attacker.example:owner/repository.git')
+        ->set('branch', 'main')
+        ->call('submit'))
+        ->toThrow(ModelNotFoundException::class);
+
+    expect(Application::query()->count())->toBe(0)
+        ->and(Storage::disk('ssh-keys')->allFiles())->toBeEmpty();
+});
+
+test('private deploy key api accepts a current team key and rejects foreign and root team keys', function () {
+    actAsDeployKeyUser($this->admin, $this->team);
+    $token = $this->admin->createToken('deploy-key-test', ['*'])->plainTextToken;
+    auth()->logout();
+
+    $this->withToken($token)
+        ->postJson('/api/v1/applications/private-deploy-key', deployKeyApiPayload($this->privateKey))
+        ->assertCreated();
+
+    foreach ([$this->otherPrivateKey, $this->rootPrivateKey] as $unownedKey) {
+        $this->withToken($token)
+            ->postJson('/api/v1/applications/private-deploy-key', deployKeyApiPayload($unownedKey))
+            ->assertNotFound();
+    }
+
+    expect(Application::query()->count())->toBe(1)
+        ->and(Application::query()->sole()->private_key_id)->toBe($this->privateKey->id);
+});
+
+test('member cannot create a private deploy key application through the api', function () {
+    actAsDeployKeyUser($this->member, $this->team);
+    $token = $this->member->createToken('deploy-key-member-test', ['*'])->plainTextToken;
+    auth()->logout();
+
+    $this->withToken($token)
+        ->postJson('/api/v1/applications/private-deploy-key', deployKeyApiPayload($this->privateKey))
+        ->assertForbidden();
+
+    expect(Application::query()->count())->toBe(0);
+});