diff --git a/framework/CHANGELOG.md b/framework/CHANGELOG.md
index 1dfbfdb..acaf4aa 100644
--- a/framework/CHANGELOG.md
+++ b/framework/CHANGELOG.md
@@ -4,6 +4,7 @@ Yii Framework 2 Change Log
 2.0.38 under development
 ------------------------
 
+- Bug #18269: Fix integer safe attribute to work properly in `yii\base\Model` (Ladone)
 - Enh #18236: Allow `yii\filters\RateLimiter` to accept a closure function for the `$user` property in order to assign values on runtime (nadar)
 - Bug #18233: Add PHP 8 support (samdark)
 - Bug #18239: Fix support of no-extension files for `FileValidator::validateExtension()` (darkdef)
diff --git a/framework/base/Model.php b/framework/base/Model.php
index 9080625..b525b16 100644
--- a/framework/base/Model.php
+++ b/framework/base/Model.php
@@ -798,7 +798,7 @@ class Model extends Component implements StaticInstanceInterface, IteratorAggreg
         }
         $attributes = [];
         foreach ($scenarios[$scenario] as $attribute) {
-            if ($attribute[0] !== '!' && !in_array('!' . $attribute, $scenarios[$scenario])) {
+            if (strncmp($attribute, '!', 1) !== 0 && !in_array('!' . $attribute, $scenarios[$scenario])) {
                 $attributes[] = $attribute;
             }
         }
diff --git a/tests/framework/base/ModelTest.php b/tests/framework/base/ModelTest.php
index 2e3c082..4fedffb 100644
--- a/tests/framework/base/ModelTest.php
+++ b/tests/framework/base/ModelTest.php
@@ -175,6 +175,18 @@ class ModelTest extends TestCase
         $this->assertTrue($speaker->isAttributeSafe('firstName'));
     }
 
+    public function testIsAttributeSafeForIntegerAttribute()
+    {
+        $model = new RulesModel();
+        $model->rules = [
+            [
+                [123456], 'safe',
+            ]
+        ];
+
+        $this->assertTrue($model->isAttributeSafe(123456));
+    }
+
     public function testSafeScenarios()
     {
         $model = new RulesModel();