diff --git a/give.php b/give.php
index 2b3fb75711..2a00cb3b32 100644
--- a/give.php
+++ b/give.php
@@ -6,7 +6,7 @@
  * Description: The most robust, flexible, and intuitive way to accept donations on WordPress.
  * Author: GiveWP
  * Author URI: https://givewp.com/
- * Version: 3.19.2
+ * Version: 3.19.3
  * Requires at least: 6.5
  * Requires PHP: 7.2
  * Text Domain: give
@@ -411,7 +411,7 @@ private function setup_constants()
     {
         // Plugin version.
         if (!defined('GIVE_VERSION')) {
-            define('GIVE_VERSION', '3.19.2');
+            define('GIVE_VERSION', '3.19.3');
         }
 
         // Plugin Root File.
diff --git a/includes/formatting.php b/includes/formatting.php
index ae9a3f142b..ca8ebddd02 100644
--- a/includes/formatting.php
+++ b/includes/formatting.php
@@ -735,6 +735,7 @@ function give_get_cache_key($action, $query_args)
  * Clean variables using sanitize_text_field. Arrays are cleaned recursively.
  * Non-scalar values are ignored.
  *
+ * @since 3.19.3 Don't unserialize data by default and return an empty string when data is serialized and $allow_serialized_data is false
  * @since 3.17.2 Safe unserialize data by default
  * @since  1.8
  *
@@ -748,8 +749,8 @@ function give_clean($var, $allow_serialized_data = false)
         return array_map('give_clean', $var);
     }
 
-    if ( ! $allow_serialized_data) {
-        $var = Utils::safeUnserialize($var);
+    if ( Utils::isSerialized($var)) {
+        $var = $allow_serialized_data ? Utils::safeUnserialize($var) : '';
     }
 
     return is_scalar($var) ? sanitize_text_field(wp_unslash($var)) : $var;
diff --git a/readme.txt b/readme.txt
index a1617c9973..187399efcb 100644
--- a/readme.txt
+++ b/readme.txt
@@ -5,7 +5,7 @@ Tags: donation, donate, recurring donations, fundraising, crowdfunding
 Requires at least: 6.5
 Tested up to: 6.7
 Requires PHP: 7.2
-Stable tag: 3.19.2
+Stable tag: 3.19.3
 License: GPLv3
 License URI: http://www.gnu.org/licenses/gpl-3.0.html
 
@@ -266,6 +266,9 @@ You can report security bugs through the Patchstack Vulnerability Disclosure Pro
 10. Use almost any payment gateway integration with GiveWP through our add-ons or by creating your own add-on.
 
 == Changelog ==
+= 3.19.3: December 24th, 2024 =
+* Security: Added additional sanitization to the donation form request to prevent malicious serialized data (CVE-2024-12877)
+
 = 3.19.2: December 17th, 2024 =
 * Fix: Resolved an issue with the custom donation amount field where using certain languages like Swedish were resulting in additional zero values being added
 
diff --git a/src/Helpers/Utils.php b/src/Helpers/Utils.php
index b2c46fe9a2..15412d474a 100644
--- a/src/Helpers/Utils.php
+++ b/src/Helpers/Utils.php
@@ -130,9 +130,9 @@ public static function removeBackslashes($data)
     }
 
     /**
-     * The regular expression attempts to capture the basic structure of a serialized array
-     * or object. This is more robust than the is_serialized() function but still not perfect.
+     * The regular expression attempts to capture the basic structure of all data types that can be serialized by PHP.
      *
+     * @since 3.19.3 Support all types of serialized data instead of only objects and arrays
      * @since 3.17.2
      */
     public static function containsSerializedDataRegex($data): bool
@@ -141,7 +141,15 @@ public static function containsSerializedDataRegex($data): bool
             return false;
         }
 
-        $pattern = '/(a:\d+:\{.*\})|(O:\d+:"[^"]+":\{.*\})/';
+        $pattern = '/
+        (a:\d+:\{.*\}) |         # Matches arrays (e.g: a:2:{i:0;s:5:"hello";i:1;i:42;})
+        (O:\d+:"[^"]+":\{.*\}) | # Matches objects (e.g: O:8:"stdClass":1:{s:4:"name";s:5:"James";})
+        (s:\d+:"[^"]*";) |       # Matches strings (e.g: s:5:"hello";)
+        (i:\d+;) |               # Matches integers (e.g: i:42;)
+        (b:[01];) |              # Matches booleans (e.g: b:1; or b:0;)
+        (d:\d+(\.\d+)?;) |       # Matches floats (e.g: d:3.14;)
+        (N;)                     # Matches NULL (e.g: N;)
+        /x';
 
         return preg_match($pattern, $data) === 1;
     }
diff --git a/tests/Unit/Helpers/UtilsTest.php b/tests/Unit/Helpers/UtilsTest.php
index d0fbe9cc54..68277d1ba5 100644
--- a/tests/Unit/Helpers/UtilsTest.php
+++ b/tests/Unit/Helpers/UtilsTest.php
@@ -82,6 +82,7 @@ public function testMaybeSafeUnserialize($data, bool $expected)
     }
 
     /**
+     * @since 3.19.3 Test all types of serialized data
      * @since 3.17.2
      */
     public function serializedDataProvider(): array
@@ -90,15 +91,18 @@ public function serializedDataProvider(): array
             [serialize('bar'), true],
             ['\\' . serialize('backslash-bypass'), true],
             ['\\\\' . serialize('double-backslash-bypass'), true],
-            [
-                // String with serialized data hidden in the middle of the content
-                'Lorem ipsum dolor sit amet, {a:2:{i:0;s:5:\"hello\";i:1;s:5:\"world\";}} consectetur adipiscing elit.',
-                true,
-            ],
             ['foo', false],
             [serialize('qux'), true],
             ['bar', false],
             ['foo bar', false],
+            // Strings with serialized data hidden in the middle of the content
+            ['Lorem ipsum a:2:{i:0;s:5:"hello";i:1;i:42;} dolor sit amet', true], // array
+            ['Lorem ipsum O:8:"stdClass":1:{s:4:"name";s:5:"James";} dolor sit amet', true], // object
+            ['Lorem ipsum s:5:"hello"; dolor sit amet', true], // string
+            ['Lorem ipsum i:42; dolor sit amet', true], // integer
+            ['Lorem ipsum b:1; dolor sit amet', true], // boolean
+            ['Lorem ipsum d:3.14; dolor sit amet', true], // float
+            ['Lorem ipsum N; dolor sit amet', true], // NULL
         ];
     }
 }