diff --git a/system/Test/ReflectionHelper.php b/system/Test/ReflectionHelper.php
index 47e85f4a8903..7b1584856c6b 100644
--- a/system/Test/ReflectionHelper.php
+++ b/system/Test/ReflectionHelper.php
@@ -55,7 +55,19 @@ public static function getPrivateMethodInvoker($obj, $method)
      */
     private static function getAccessibleRefProperty($obj, $property)
     {
-        $refClass = is_object($obj) ? new ReflectionObject($obj) : new ReflectionClass($obj);
+        if (! is_object($obj)) {
+            return (new ReflectionClass($obj))->getProperty($property);
+        }
+
+        $refClass = new ReflectionObject($obj);
+
+        if (! $refClass->hasProperty($property) && str_contains($obj::class, '@anonymous')) {
+            $parentClass = $refClass->getParentClass();
+
+            if ($parentClass !== false) {
+                return $parentClass->getProperty($property);
+            }
+        }
 
         return $refClass->getProperty($property);
     }
diff --git a/tests/system/Test/ReflectionHelperTest.php b/tests/system/Test/ReflectionHelperTest.php
index e110a4820422..a024586ae167 100644
--- a/tests/system/Test/ReflectionHelperTest.php
+++ b/tests/system/Test/ReflectionHelperTest.php
@@ -93,4 +93,44 @@ public function testGetPrivateMethodInvokerWithStatic(): void
             $method('param1', 'param2'),
         );
     }
+
+    public function testGetPrivatePropertyWithAnonymousObject(): void
+    {
+        $anonClassObject = new class () extends TestForReflectionHelper {
+            private string $hideMe = 'active';
+
+            public function getHideMe(): string
+            {
+                return $this->hideMe;
+            }
+        };
+
+        $hideMe  = $this->getPrivateProperty($anonClassObject, 'hideMe');
+        $private = $this->getPrivateProperty($anonClassObject, 'private');
+
+        $this->assertSame('active', $hideMe);
+        $this->assertSame($anonClassObject->getPrivate(), $private);
+    }
+
+    public function testSetPrivatePropertyWithAnonymousObject(): void
+    {
+        $anonClassObject = new class () extends TestForReflectionHelper {
+            private string $hideMe = 'active';
+
+            public function getHideMe(): string
+            {
+                return $this->hideMe;
+            }
+        };
+
+        $this->setPrivateProperty($anonClassObject, 'hideMe', 'inactive');
+        $this->setPrivateProperty($anonClassObject, 'private', 'new secret');
+
+        $hideMe  = $this->getPrivateProperty($anonClassObject, 'hideMe');
+        $private = $this->getPrivateProperty($anonClassObject, 'private');
+
+        $this->assertSame('inactive', $hideMe);
+        $this->assertSame('new secret', $private);
+        $this->assertSame('new secret', $anonClassObject->getPrivate());
+    }
 }
diff --git a/user_guide_src/source/changelogs/v4.7.0.rst b/user_guide_src/source/changelogs/v4.7.0.rst
index c4dcb7d7d40f..24cd86556eca 100644
--- a/user_guide_src/source/changelogs/v4.7.0.rst
+++ b/user_guide_src/source/changelogs/v4.7.0.rst
@@ -250,13 +250,14 @@ Libraries
 - **View:** Added the ability to override namespaced views (e.g., from modules/packages) by placing a matching file structure within the **app/Views/overrides** directory. See :ref:`Overriding Namespaced Views <views-overriding-namespaced-views>` for details.
 - **Toolbar:** Fixed an issue where the Debug Toolbar was incorrectly injected into responses generated by third-party libraries (e.g., Dompdf) that use native PHP headers instead of the framework's Response object.
 
-
 Commands
 ========
 
 Testing
 =======
 
+-The ``CodeIgniter\Test\ReflectionHelper::getPrivateProperty`` and ``CodeIgniter\Test\ReflectionHelper::setPrivateProperty`` methods has added support for accessing the private properties of an anonymous class that extends the parent class.
+
 Database
 ========
 
@@ -306,7 +307,6 @@ Changes
 - **Paths:** Added support for changing the location of the ``.env`` file via the ``Paths::$envDirectory`` property.
 - **Toolbar:** Added ``$disableOnHeaders`` property to **app/Config/Toolbar.php**.
 
-
 ************
 Deprecations
 ************
diff --git a/user_guide_src/source/testing/overview.rst b/user_guide_src/source/testing/overview.rst
index 8a94d6bc382c..3149d9823fbc 100644
--- a/user_guide_src/source/testing/overview.rst
+++ b/user_guide_src/source/testing/overview.rst
@@ -224,6 +224,10 @@ instance of the class to test. The second parameter is the name of the property.
 
 .. literalinclude:: overview/014.php
 
+.. versionadded:: 4.7.0
+
+You can access private properties for anonymous classes that extend the parent class.
+
 setPrivateProperty($instance, $property, $value)
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
@@ -232,6 +236,10 @@ parameter is the name of the property to set the value of. The third parameter i
 
 .. literalinclude:: overview/015.php
 
+.. versionadded:: 4.7.0
+
+You can access private properties for anonymous classes that extend the parent class.
+
 Mocking Services
 ================
 
diff --git a/user_guide_src/source/testing/overview/014.php b/user_guide_src/source/testing/overview/014.php
index eb2509ac64b8..d9fe0a005337 100644
--- a/user_guide_src/source/testing/overview/014.php
+++ b/user_guide_src/source/testing/overview/014.php
@@ -5,5 +5,8 @@
 // Create an instance of the class to test
 $obj = new Foo();
 
-// Test the value
+// or anonymous class
+// $obj = new class () extends Foo {};
+
+// Test the value from Foo
 $this->assertEquals('bar', $this->getPrivateProperty($obj, 'baz'));
diff --git a/user_guide_src/source/testing/overview/015.php b/user_guide_src/source/testing/overview/015.php
index 059c55a12011..4a9dcbdba9a6 100644
--- a/user_guide_src/source/testing/overview/015.php
+++ b/user_guide_src/source/testing/overview/015.php
@@ -5,7 +5,10 @@
 // Create an instance of the class to test
 $obj = new Foo();
 
-// Set the value
+// or create anonymous class
+// $obj = new class () extends Foo {};
+
+// Set the value to Foo
 $this->setPrivateProperty($obj, 'baz', 'oops!');
 
 // Do normal testing...