diff --git a/app/Http/Requests/Passport/AuthForget.php b/app/Http/Requests/Passport/AuthForget.php
index 8106f28..6442cab 100644
--- a/app/Http/Requests/Passport/AuthForget.php
+++ b/app/Http/Requests/Passport/AuthForget.php
@@ -16,7 +16,7 @@ class AuthForget extends FormRequest
         return [
             'email' => 'required|email:strict',
             'password' => 'required|min:8',
-            'email_code' => 'required'
+            'email_code' => 'required|digits:6'
         ];
     }
 
@@ -27,7 +27,8 @@ class AuthForget extends FormRequest
             'email.email' => __('Email format is incorrect'),
             'password.required' => __('Password can not be empty'),
             'password.min' => __('Password must be greater than 8 digits'),
-            'email_code.required' => __('Email verification code cannot be empty')
+            'email_code.required' => __('Email verification code cannot be empty'),
+            'email_code.digits' => __('Incorrect email verification code')
         ];
     }
 }
diff --git a/app/Services/Auth/LoginService.php b/app/Services/Auth/LoginService.php
index 363e82b..814fffb 100644
--- a/app/Services/Auth/LoginService.php
+++ b/app/Services/Auth/LoginService.php
@@ -93,7 +93,8 @@ class LoginService
         }
 
         // 验证邮箱验证码
-        if ((string) Cache::get(CacheKey::get('EMAIL_VERIFY_CODE', $email)) !== (string) $emailCode) {
+        $cachedEmailCode = Cache::get(CacheKey::get('EMAIL_VERIFY_CODE', $email));
+        if ($cachedEmailCode === null || !hash_equals((string) $cachedEmailCode, $emailCode)) {
             Cache::put($forgetRequestLimitKey, $forgetRequestLimit ? $forgetRequestLimit + 1 : 1, 300);
             return [false, [400, __('Incorrect email verification code')]];
         }
diff --git a/tests/Unit/Services/Auth/LoginServiceTest.php b/tests/Unit/Services/Auth/LoginServiceTest.php
new file mode 100644
index 0000000..28fc878
--- /dev/null
+++ b/tests/Unit/Services/Auth/LoginServiceTest.php
@@ -0,0 +1,83 @@
+<?php
+
+namespace Tests\Unit\Services\Auth;
+
+use App\Models\User;
+use App\Services\Auth\LoginService;
+use App\Utils\CacheKey;
+use App\Utils\Helper;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\Cache;
+use Illuminate\Support\Facades\Validator;
+use Tests\TestCase;
+
+class LoginServiceTest extends TestCase
+{
+    use RefreshDatabase;
+
+    private LoginService $service;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        Cache::flush();
+        $this->service = app(LoginService::class);
+    }
+
+    public function test_reset_password_rejects_missing_cached_email_code(): void
+    {
+        $user = $this->createUser('victim@example.com', 'old-password');
+
+        [$success, $result] = $this->service->resetPassword($user->email, '', 'new-password');
+
+        $this->assertFalse($success);
+        $this->assertSame(400, $result[0]);
+
+        $user->refresh();
+        $this->assertTrue(password_verify('old-password', $user->password));
+    }
+
+    public function test_reset_password_accepts_matching_cached_email_code(): void
+    {
+        $user = $this->createUser('user@example.com', 'old-password');
+        Cache::put(CacheKey::get('EMAIL_VERIFY_CODE', $user->email), 123456, 300);
+
+        [$success, $result] = $this->service->resetPassword($user->email, '123456', 'new-password');
+
+        $this->assertTrue($success);
+        $this->assertTrue($result);
+
+        $user->refresh();
+        $this->assertTrue(password_verify('new-password', $user->password));
+        $this->assertNull(Cache::get(CacheKey::get('EMAIL_VERIFY_CODE', $user->email)));
+    }
+
+    public function test_forget_password_validation_rejects_boolean_email_code(): void
+    {
+        $validator = Validator::make([
+            'email' => 'victim@example.com',
+            'password' => 'new-password',
+            'email_code' => false,
+        ], [
+            'email' => 'required|email:strict',
+            'password' => 'required|min:8',
+            'email_code' => 'required|digits:6',
+        ]);
+
+        $this->assertTrue($validator->fails());
+        $this->assertArrayHasKey('email_code', $validator->errors()->toArray());
+    }
+
+    private function createUser(string $email, string $password): User
+    {
+        return User::query()->create([
+            'email' => $email,
+            'password' => password_hash($password, PASSWORD_DEFAULT),
+            'uuid' => Helper::guid(true),
+            'token' => Helper::guid(true),
+            'created_at' => time(),
+            'updated_at' => time(),
+        ]);
+    }
+}
\ No newline at end of file