diff --git a/src/wp-admin/network/site-new.php b/src/wp-admin/network/site-new.php
index 4eafec5938dd3..70316ab330e30 100644
--- a/src/wp-admin/network/site-new.php
+++ b/src/wp-admin/network/site-new.php
@@ -140,6 +140,11 @@
 		do_action( 'network_site_new_created_user', $user_id );
 	}
 
+	/**
+	 * @global wpdb $wpdb WordPress database abstraction object.
+	 */
+	global $wpdb;
+
 	$wpdb->hide_errors();
 	$id = wpmu_create_blog( $newdomain, $path, $title, $user_id, $meta, get_current_network_id() );
 	$wpdb->show_errors();
diff --git a/src/wp-admin/options.php b/src/wp-admin/options.php
index b45cbb00387ce..9413eb3b1a93b 100644
--- a/src/wp-admin/options.php
+++ b/src/wp-admin/options.php
@@ -396,6 +396,11 @@
 		<input type="hidden" name="option_page" value="options" />
 		<table class="form-table" role="presentation">
 <?php
+/**
+ * @global wpdb $wpdb WordPress database abstraction object.
+ */
+global $wpdb;
+
 $options = $wpdb->get_results( "SELECT * FROM $wpdb->options ORDER BY option_name" );
 
 foreach ( (array) $options as $option ) :
diff --git a/src/wp-admin/upload.php b/src/wp-admin/upload.php
index 7cf0f6fe10108..3c30e2eb4d2b3 100644
--- a/src/wp-admin/upload.php
+++ b/src/wp-admin/upload.php
@@ -262,6 +262,11 @@ function () {
 	$post_ids = array();
 
 	if ( 'delete_all' === $doaction ) {
+		/**
+		 * @global wpdb $wpdb WordPress database abstraction object.
+		 */
+		global $wpdb;
+
 		$post_ids = $wpdb->get_col( "SELECT ID FROM $wpdb->posts WHERE post_type='attachment' AND post_status = 'trash'" );
 		$doaction = 'delete';
 	} elseif ( isset( $_REQUEST['media'] ) ) {
diff --git a/src/wp-admin/user-edit.php b/src/wp-admin/user-edit.php
index 8055de6b36385..9a31f13e58d29 100644
--- a/src/wp-admin/user-edit.php
+++ b/src/wp-admin/user-edit.php
@@ -104,6 +104,11 @@
 	wp_die( __( 'Sorry, you are not allowed to edit this user.' ) );
 }
 
+/**
+ * @global wpdb $wpdb WordPress database abstraction object.
+ */
+global $wpdb;
+
 // Execute confirmed email change. See send_confirmation_on_profile_email().
 if ( IS_PROFILE_PAGE && isset( $_GET['newuseremail'] ) && $current_user->ID ) {
 	$new_email = get_user_meta( $current_user->ID, '_new_email', true );
diff --git a/src/wp-admin/user-new.php b/src/wp-admin/user-new.php
index 453a0de54fa55..73d74aa6db9c7 100644
--- a/src/wp-admin/user-new.php
+++ b/src/wp-admin/user-new.php
@@ -240,6 +240,11 @@
 			);
 
 			if ( isset( $_POST['noconfirmation'] ) && current_user_can( 'manage_network_users' ) ) {
+				/**
+				 * @global wpdb $wpdb WordPress database abstraction object.
+				 */
+				global $wpdb;
+
 				$key      = $wpdb->get_var( $wpdb->prepare( "SELECT activation_key FROM {$wpdb->signups} WHERE user_login = %s AND user_email = %s", $new_user_login, $new_user_email ) );
 				$new_user = wpmu_activate_signup( $key );
 				if ( is_wp_error( $new_user ) ) {
diff --git a/tests/phpstan/baselines/variable.undefined.neon b/tests/phpstan/baselines/variable.undefined.neon
index 4fd47e0948b73..4089e7908f525 100644
--- a/tests/phpstan/baselines/variable.undefined.neon
+++ b/tests/phpstan/baselines/variable.undefined.neon
@@ -348,11 +348,6 @@ parameters:
 			identifier: variable.undefined
 			count: 2
 			path: ../../../src/wp-admin/network/admin.php
-		-
-			message: '#^Variable \$wpdb might not be defined\.$#'
-			identifier: variable.undefined
-			count: 2
-			path: ../../../src/wp-admin/network/site-new.php
 		-
 			message: '#^Variable \$wpdb might not be defined\.$#'
 			identifier: variable.undefined
@@ -408,11 +403,6 @@ parameters:
 			identifier: variable.undefined
 			count: 1
 			path: ../../../src/wp-admin/options.php
-		-
-			message: '#^Variable \$wpdb might not be defined\.$#'
-			identifier: variable.undefined
-			count: 2
-			path: ../../../src/wp-admin/options.php
 		-
 			message: '#^Variable \$page might not be defined\.$#'
 			identifier: variable.undefined
@@ -508,11 +498,6 @@ parameters:
 			identifier: variable.undefined
 			count: 1
 			path: ../../../src/wp-admin/upgrade.php
-		-
-			message: '#^Variable \$wpdb might not be defined\.$#'
-			identifier: variable.undefined
-			count: 2
-			path: ../../../src/wp-admin/upload.php
 		-
 			message: '#^Variable \$_wp_admin_css_colors might not be defined\.$#'
 			identifier: variable.undefined
@@ -528,21 +513,11 @@ parameters:
 			identifier: variable.undefined
 			count: 1
 			path: ../../../src/wp-admin/user-edit.php
-		-
-			message: '#^Variable \$wpdb might not be defined\.$#'
-			identifier: variable.undefined
-			count: 12
-			path: ../../../src/wp-admin/user-edit.php
 		-
 			message: '#^Variable \$blog_id might not be defined\.$#'
 			identifier: variable.undefined
 			count: 1
 			path: ../../../src/wp-admin/user-new.php
-		-
-			message: '#^Variable \$wpdb might not be defined\.$#'
-			identifier: variable.undefined
-			count: 3
-			path: ../../../src/wp-admin/user-new.php
 		-
 			message: '#^Variable \$current_blog might not be defined\.$#'
 			identifier: variable.undefined