diff --git a/src/wp-admin/post.php b/src/wp-admin/post.php
index dd7bad1bb3830..055e0abefef63 100644
--- a/src/wp-admin/post.php
+++ b/src/wp-admin/post.php
@@ -72,13 +72,16 @@
 switch ( $action ) {
 	case 'post-quickdraft-save':
 		// Check nonce and capabilities.
-		$nonce     = $_REQUEST['_wpnonce'];
+		$nonce   = $_REQUEST['_wpnonce'] ?? '';
+		$post_id = (int) ( $_REQUEST['post_ID'] ?? 0 );
+		// Explicitly check for a positive ID to avoid falling back to the global $post object.
+		$post      = ( $post_id > 0 ) ? get_post( $post_id ) : null;
 		$error_msg = false;
 
 		// For output of the Quick Draft dashboard widget.
 		require_once ABSPATH . 'wp-admin/includes/dashboard.php';
 
-		if ( ! wp_verify_nonce( $nonce, 'add-post' ) ) {
+		if ( ! $post || ! wp_verify_nonce( $nonce, 'add-post' ) ) {
 			$error_msg = __( 'Unable to submit this form, please refresh and try again.' );
 		}
 
@@ -90,7 +93,6 @@
 			return wp_dashboard_quick_press( $error_msg );
 		}
 
-		$post = get_post( $_REQUEST['post_ID'] );
 		check_admin_referer( 'add-' . $post->post_type );
 
 		$_POST['comment_status'] = get_default_comment_status( $post->post_type );
diff --git a/tests/phpunit/tests/admin/wpPost.php b/tests/phpunit/tests/admin/wpPost.php
new file mode 100644
index 0000000000000..ec69faba8b91a
--- /dev/null
+++ b/tests/phpunit/tests/admin/wpPost.php
@@ -0,0 +1,111 @@
+<?php
+
+/**
+ * @group admin
+ */
+class Tests_Admin_Post_QuickDraftSave extends WP_UnitTestCase {
+	protected static $admin_id;
+
+	public static function wpSetUpBeforeClass( WP_UnitTest_Factory $factory ): void {
+		self::$admin_id = $factory->user->create( array( 'role' => 'administrator' ) );
+	}
+
+	public function set_up() {
+		parent::set_up();
+		wp_set_current_user( self::$admin_id );
+		set_current_screen( 'dashboard' );
+	}
+
+	public function tear_down() {
+		parent::tear_down();
+		set_current_screen( 'front' );
+		unset( $_REQUEST['_wpnonce'], $_REQUEST['post_ID'], $_REQUEST['action'] );
+	}
+
+	/**
+	 * Test Happy Path: Successfully validating a correct nonce and post_ID.
+	 *
+	 * @ticket 65052
+	 */
+	public function test_post_quickdraft_save_happy_path() {
+		$post_id = self::factory()->post->create( array( 'post_status' => 'draft' ) );
+		$nonce   = wp_create_nonce( 'add-post' );
+
+		$_REQUEST['_wpnonce'] = $nonce;
+		$_REQUEST['post_ID']  = $post_id;
+
+		$nonce_req = $_REQUEST['_wpnonce'] ?? '';
+		$id_req    = (int) ( $_REQUEST['post_ID'] ?? 0 );
+		$post      = $id_req ? get_post( $id_req ) : null;
+
+		$error_msg = false;
+		if ( ! $post || ! wp_verify_nonce( $nonce_req, 'add-post' ) ) {
+			$error_msg = __( 'Unable to submit this form, please refresh and try again.' );
+		}
+
+		$this->assertFalse( $error_msg, 'Happy path should not produce an error message.' );
+		$this->assertNotNull( $post );
+		$this->assertEquals( $post_id, $post->ID );
+	}
+
+	/**
+	 * test post quickdraft save missing nonce
+	 *
+	 * @ticket 65052
+	 */
+	public function test_post_quickdraft_save_missing_nonce() {
+		$_REQUEST['action'] = 'post-quickdraft-save';
+		unset( $_REQUEST['_wpnonce'] ); // invliad nonce
+		$_REQUEST['post_ID'] = 0;
+
+		$nonce   = $_REQUEST['_wpnonce'] ?? '';
+		$post_id = (int) ( $_REQUEST['post_ID'] ?? 0 );
+		$post    = $post_id ? get_post( $post_id ) : null;
+
+		$error_msg = false;
+		if ( ! $post || ! wp_verify_nonce( $nonce, 'add-post' ) ) {
+			$error_msg = __( 'Unable to submit this form, please refresh and try again.' );
+		}
+
+		$this->assertSame( 'Unable to submit this form, please refresh and try again.', $error_msg );
+	}
+
+	/**
+	 * test post quickdraft save invalid all
+	 *
+	 * @ticket 65052
+	 */
+	public function test_post_quickdraft_save_invalid_all() {
+		$_REQUEST['_wpnonce'] = 'invalid_nonce';
+		$_REQUEST['post_ID']  = -1; // invalid ID
+
+		$nonce   = $_REQUEST['_wpnonce'] ?? '';
+		$post_id = (int) ( $_REQUEST['post_ID'] ?? 0 );
+		$post    = $post_id ? get_post( $post_id ) : null;
+
+		$this->assertNull( $post );
+
+		$error_msg = false;
+		if ( ! $post || ! wp_verify_nonce( $nonce, 'add-post' ) ) {
+			$error_msg = __( 'Unable to submit this form, please refresh and try again.' );
+		}
+
+		$this->assertNotEmpty( $error_msg );
+	}
+
+	/**
+	 * test post quickdraft save should not use global post
+	 *
+	 * @ticket 65052
+	 */
+	public function test_post_quickdraft_save_should_not_use_global_post() {
+		$other_post_id   = self::factory()->post->create();
+		$GLOBALS['post'] = get_post( $other_post_id );
+
+		$_REQUEST['post_ID'] = 0;
+		$post_id             = (int) $_REQUEST['post_ID'];
+		$post                = ( $post_id > 0 ) ? get_post( $post_id ) : null;
+
+		$this->assertNull( $post, 'Should return null instead of falling back to global post.' );
+	}
+}