diff --git a/wp-admin/includes/dashboard.php b/wp-admin/includes/dashboard.php
index 9e52d93b42..3731768818 100644
--- a/wp-admin/includes/dashboard.php
+++ b/wp-admin/includes/dashboard.php
@@ -1212,9 +1212,9 @@ function wp_check_browser_version() {
 		 *  'img_src' - string - An image representing the browser
 		 *  'img_src_ssl' - string - An image (over SSL) representing the browser
 		 */
-		$response = unserialize( wp_remote_retrieve_body( $response ) );
+		$response = maybe_unserialize( wp_remote_retrieve_body( $response ) );
 
-		if ( ! $response )
+		if ( ! is_array( $response ) )
 			return false;
 
 		set_site_transient( 'browser_' . $key, $response, 604800 ); // cache for 1 week
diff --git a/wp-includes/ms-functions.php b/wp-includes/ms-functions.php
index 03252152e3..b939c92c92 100644
--- a/wp-includes/ms-functions.php
+++ b/wp-includes/ms-functions.php
@@ -843,7 +843,7 @@ function wpmu_activate_signup($key) {
 			return new WP_Error( 'already_active', __( 'The site is already active.' ), $signup );
 	}
 
-	$meta = unserialize($signup->meta);
+	$meta = maybe_unserialize($signup->meta);
 	$user_login = $wpdb->escape($signup->user_login);
 	$user_email = $wpdb->escape($signup->user_email);
 	$password = wp_generate_password( 12, false );
diff --git a/wp-includes/user.php b/wp-includes/user.php
index 11ea2b277b..6b342c8576 100644
--- a/wp-includes/user.php
+++ b/wp-includes/user.php
@@ -885,14 +885,14 @@ function count_users($strategy = 'time') {
 		$users_of_blog = $wpdb->get_col( "SELECT meta_value FROM $wpdb->usermeta WHERE meta_key = '{$blog_prefix}capabilities'" );
 
 		foreach ( $users_of_blog as $caps_meta ) {
-			$b_roles = unserialize($caps_meta);
-			if ( is_array($b_roles) ) {
-				foreach ( $b_roles as $b_role => $val ) {
-					if ( isset($avail_roles[$b_role]) ) {
-						$avail_roles[$b_role]++;
-					} else {
-						$avail_roles[$b_role] = 1;
-					}
+			$b_roles = maybe_unserialize($caps_meta);
+			if ( ! is_array( $b_roles ) )
+				continue;
+			foreach ( $b_roles as $b_role => $val ) {
+				if ( isset($avail_roles[$b_role]) ) {
+					$avail_roles[$b_role]++;
+				} else {
+					$avail_roles[$b_role] = 1;
 				}
 			}
 		}