diff --git a/README.md b/README.md
index 32f7a9b..352adf3 100644
--- a/README.md
+++ b/README.md
@@ -78,7 +78,33 @@ return [
    * you can customize this key to avoid conflicts.
    * Simply provide your preferred key name as a string value.
    */
-  'session_key' => 'utm'
+  'session_key' => 'utm',
+
+  /*
+    * Allowed UTM Parameters (default: ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content', 'utm_campaign_id'])
+    *
+    * This setting defines the UTM parameters that are allowed within your application.
+    *
+    * In this array, you can specify a list of allowed UTM parameter names. Each parameter should be listed as a string.
+    * Only parameters from this list will be stored and processed in the session.
+    * and any parameter without the 'utm_' prefix will be ignored regardless of its inclusion in this list.
+    *
+    * Example: To only allow the basic UTM parameters (source, medium, and campaign), you could update the array like this:
+    *
+    * 'allowed_utm_parameters' => [
+    *     'utm_source',
+    *     'utm_medium',
+    *     'utm_campaign',
+    * ],
+    */
+    'allowed_utm_parameters' => [
+        'utm_source',
+        'utm_medium',
+        'utm_campaign',
+        'utm_term',
+        'utm_content',
+        'utm_campaign_id'
+    ],
 ];
 ```
 
diff --git a/src/UtmParameter.php b/src/UtmParameter.php
index 01a7002..c99a327 100644
--- a/src/UtmParameter.php
+++ b/src/UtmParameter.php
@@ -144,8 +144,8 @@ public static function contains(string $key, string $value)
      */
     public static function clear()
     {
-        app(UtmParameter::class)->parameters = null;
         session()->forget(app(UtmParameter::class)->sessionKey);
+        app(UtmParameter::class)->parameters = null;
         return true;
     }
 
@@ -156,9 +156,16 @@ public static function clear()
      */
     protected static function getParameter(Request $request)
     {
+        $allowedKeys = config('utm-parameter.allowed_utm_parameters', [
+            'utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content'
+        ]);
+
         return collect($request->all())
             ->filter(fn ($value, $key) => substr($key, 0, 4) === 'utm_')
-            ->map(fn ($value) => htmlspecialchars($value, ENT_QUOTES, 'UTF-8'))
+            ->filter(fn ($value, $key) => in_array($key, $allowedKeys))
+            ->mapWithKeys(fn ($value, $key) => [
+                htmlspecialchars($key, ENT_QUOTES, 'UTF-8') => htmlspecialchars($value, ENT_QUOTES, 'UTF-8')
+            ])
             ->toArray();
     }
 
diff --git a/src/config/utm-parameter.php b/src/config/utm-parameter.php
index 1820930..0e5fb44 100644
--- a/src/config/utm-parameter.php
+++ b/src/config/utm-parameter.php
@@ -20,5 +20,31 @@
    * you can customize this key to avoid conflicts.
    * Simply provide your preferred key name as a string value.
    */
-  'session_key' => 'utm'
+  'session_key' => 'utm',
+
+  /*
+    * Allowed UTM Parameters (default: ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content', 'utm_campaign_id'])
+    *
+    * This setting defines the UTM parameters that are allowed within your application.
+    *
+    * In this array, you can specify a list of allowed UTM parameter names. Each parameter should be listed as a string.
+    * Only parameters from this list will be stored and processed in the session.
+    * and any parameter without the 'utm_' prefix will be ignored regardless of its inclusion in this list.
+    *
+    * Example: To only allow the basic UTM parameters (source, medium, and campaign), you could update the array like this:
+    *
+    * 'allowed_utm_parameters' => [
+    *     'utm_source',
+    *     'utm_medium',
+    *     'utm_campaign',
+    * ],
+    */
+    'allowed_utm_parameters' => [
+        'utm_source',
+        'utm_medium',
+        'utm_campaign',
+        'utm_term',
+        'utm_content',
+        'utm_campaign_id'
+    ],
 ];
diff --git a/tests/UtmParameterTest.php b/tests/UtmParameterTest.php
index de127ee..9044ecf 100644
--- a/tests/UtmParameterTest.php
+++ b/tests/UtmParameterTest.php
@@ -32,6 +32,16 @@ public function setUp(): void
         session([$this->sessionKey => $parameters]);
     }
 
+    public function tearDown() : void
+    {
+        session()->forget($this->sessionKey);
+
+        Config::set('utm-parameter.override_utm_parameters', null);
+        Config::set('utm-parameter.session_key', null);
+
+        parent::tearDown();
+    }
+
     public function test_it_should_be_bound_in_the_app()
     {
         $utm = app(UtmParameter::class);
@@ -343,4 +353,89 @@ public function test_it_should_keep_existing_parameters_while_browsing()
         $source = UtmParameter::get('source');
         $this->assertEquals('google', $source);
     }
+
+    public function test_it_should_only_use_utm_parameters_in_the_allowed_list()
+    {
+        session()->forget($this->sessionKey);
+        Config::set('utm-parameter.override_utm_parameters', true);
+        Config::set('utm-parameter.allowed_utm_parameters', ['utm_source', 'utm_medium']);
+
+        $parameters = [
+            'utm_source'=> 'newsletter',
+            'utm_medium' => 'email',
+            'utm_campaign' => 'not-allowed'
+        ];
+
+        $request = Request::create('/test', 'GET', $parameters);
+        app(UtmParameter::class)->boot($request);
+
+        $source = UtmParameter::get('source');
+        $this->assertEquals('newsletter', $source);
+        $this->assertIsNotInt($source);
+        $this->assertNotEmpty($source);
+
+        $medium = UtmParameter::get('medium');
+        $this->assertEquals('email', $medium);
+        $this->assertIsNotInt($medium);
+        $this->assertNotEmpty($medium);
+
+        $campaign = UtmParameter::get('campaign');
+        $this->assertNull($campaign);
+        $this->assertEmpty($campaign);
+
+        $term = UtmParameter::get('term');
+        $this->assertNull($term);
+        $this->assertEmpty($term);
+
+        $utm_campaign_id = UtmParameter::get('utm_campaign_id');
+        $this->assertNull($utm_campaign_id);
+        $this->assertEmpty($utm_campaign_id);
+    }
+
+    public function test_it_should_sanitize_utm_parameter()
+    {
+        Config::set('utm-parameter.override_utm_parameters', true);
+
+        $parameters = [
+            'utm_source'=> '<span onclick="alert(\'alert\')">google</span>',
+            'utm_medium' => 'cpc<script>alert(1)</script>',
+            'utm_campaign' => '<script href="x" onload="alert(1)">',
+            'utm_content' => '<img src="x" onerror="alert(1)">',
+            'utm_term' => '%3Cscript%3Ealert(1)%3C%2Fscript%3E',
+            'utm_sql_injection' => '" OR 1=1; --',
+            'utm_html_tag' => '<b>bold</b>',
+            'utm_<html onclick="alert(\'alert\')">_tag' => '<b>bold</b>',
+            'utm_" OR 1=1; --' => '<b>bold</b>',
+        ];
+
+        $request = Request::create('/test', 'GET', $parameters);
+        app(UtmParameter::class)->boot($request);
+
+        $source = UtmParameter::get('source');
+        $this->assertEquals('&lt;span onclick=&quot;alert(&#039;alert&#039;)&quot;&gt;google&lt;/span&gt;', $source);
+
+        $medium = UtmParameter::get('medium');
+        $this->assertEquals('cpc&lt;script&gt;alert(1)&lt;/script&gt;', $medium);
+
+        $campaign = UtmParameter::get('campaign');
+        $this->assertEquals('&lt;script href=&quot;x&quot; onload=&quot;alert(1)&quot;&gt;', $campaign);
+
+        $content = UtmParameter::get('content');
+        $this->assertEquals('&lt;img src=&quot;x&quot; onerror=&quot;alert(1)&quot;&gt;', $content);
+
+        $term = UtmParameter::get('term');
+        $this->assertEquals('%3Cscript%3Ealert(1)%3C%2Fscript%3E', $term);
+
+        $sql = UtmParameter::get('sql_injection');
+        $this->assertNull($sql);
+
+        $html = UtmParameter::get('html_tag');
+        $this->assertNull($html);
+
+        $randomKey = UtmParameter::get('utm_&lt;html onclick=&quot;alert(&#039;alert&#039;)&quot;&gt;_tag');
+        $this->assertNull($randomKey);
+
+        $randomSqlKey = UtmParameter::get('utm_&quot; OR 1=1; --');
+        $this->assertNull($randomSqlKey);
+    }
 }