Index: wp-admin/custom-background.php
===================================================================
--- wp-admin/custom-background.php	(revision 30231)
+++ wp-admin/custom-background.php	(working copy)
@@ -282,7 +282,7 @@
 <tr>
 <th scope="row"><?php _e('Remove Image'); ?></th>
 <td>
-<form method="post" action="">
+<form method="post">
 <?php wp_nonce_field('custom-background-remove', '_wpnonce-custom-background-remove'); ?>
 <?php submit_button( __( 'Remove Background Image' ), 'button', 'remove-background', false ); ?><br/>
 <?php _e('This will remove the background image. You will not be able to restore any customizations.') ?>
@@ -296,7 +296,7 @@
 <tr>
 <th scope="row"><?php _e('Restore Original Image'); ?></th>
 <td>
-<form method="post" action="">
+<form method="post">
 <?php wp_nonce_field('custom-background-reset', '_wpnonce-custom-background-reset'); ?>
 <?php submit_button( __( 'Restore Original Image' ), 'button', 'reset-background', false ); ?><br/>
 <?php _e('This will restore the original background image. You will not be able to restore any customizations.') ?>
@@ -307,7 +307,7 @@
 
 <tr>
 <th scope="row"><?php _e('Select Image'); ?></th>
-<td><form enctype="multipart/form-data" id="upload-form" class="wp-upload-form" method="post" action="">
+<td><form enctype="multipart/form-data" id="upload-form" class="wp-upload-form" method="post">
 	<p>
 		<label for="upload"><?php _e( 'Choose an image from your computer:' ); ?></label><br />
 		<input type="file" id="upload" name="import" />
@@ -328,7 +328,7 @@
 </table>
 
 <h3><?php _e('Display Options') ?></h3>
-<form method="post" action="">
+<form method="post">
 <table class="form-table">
 <tbody>
 <?php if ( get_background_image() ) : ?>
Index: wp-admin/edit-comments.php
===================================================================
--- wp-admin/edit-comments.php	(revision 30231)
+++ wp-admin/edit-comments.php	(working copy)
@@ -224,7 +224,7 @@
 
 <?php $wp_list_table->views(); ?>
 
-<form id="comments-form" action="" method="get">
+<form id="comments-form" method="get">
 
 <?php $wp_list_table->search_box( __( 'Search Comments' ), 'comment' ); ?>
 
Index: wp-admin/edit-tags.php
===================================================================
--- wp-admin/edit-tags.php	(revision 30231)
+++ wp-admin/edit-tags.php	(working copy)
@@ -308,7 +308,7 @@
 endif; ?>
 <div id="ajax-response"></div>
 
-<form class="search-form" action="" method="get">
+<form class="search-form" method="get">
 <input type="hidden" name="taxonomy" value="<?php echo esc_attr($taxonomy); ?>" />
 <input type="hidden" name="post_type" value="<?php echo esc_attr($post_type); ?>" />
 
@@ -321,7 +321,7 @@
 
 <div id="col-right">
 <div class="col-wrap">
-<form id="posts-filter" action="" method="post">
+<form id="posts-filter" method="post">
 <input type="hidden" name="taxonomy" value="<?php echo esc_attr($taxonomy); ?>" />
 <input type="hidden" name="post_type" value="<?php echo esc_attr($post_type); ?>" />
 
Index: wp-admin/edit.php
===================================================================
--- wp-admin/edit.php	(revision 30231)
+++ wp-admin/edit.php	(working copy)
@@ -307,7 +307,7 @@
 
 <?php $wp_list_table->views(); ?>
 
-<form id="posts-filter" action="" method="get">
+<form id="posts-filter" method="get">
 
 <?php $wp_list_table->search_box( $post_type_object->labels->search_items, 'post' ); ?>
 
Index: wp-admin/export.php
===================================================================
--- wp-admin/export.php	(revision 30231)
+++ wp-admin/export.php	(working copy)
@@ -152,7 +152,7 @@
 <p><?php _e('Once you&#8217;ve saved the download file, you can use the Import function in another WordPress installation to import the content from this site.'); ?></p>
 
 <h3><?php _e( 'Choose what to export' ); ?></h3>
-<form action="" method="get" id="export-filters">
+<form method="get" id="export-filters">
 <input type="hidden" name="download" value="true" />
 <p><label><input type="radio" name="content" value="all" checked="checked" /> <?php _e( 'All content' ); ?></label></p>
 <p class="description"><?php _e( 'This will contain all of your posts, pages, comments, custom fields, terms, navigation menus and custom posts.' ); ?></p>
Index: wp-admin/includes/class-wp-posts-list-table.php
===================================================================
--- wp-admin/includes/class-wp-posts-list-table.php	(revision 30231)
+++ wp-admin/includes/class-wp-posts-list-table.php	(working copy)
@@ -930,7 +930,7 @@
 
 	?>
 
-	<form method="get" action=""><table style="display: none"><tbody id="inlineedit">
+	<form method="get"><table style="display: none"><tbody id="inlineedit">
 		<?php
 		$hclass = count( $hierarchical_taxonomies ) ? 'post' : 'page';
 		$bulk = 0;
Index: wp-admin/includes/class-wp-terms-list-table.php
===================================================================
--- wp-admin/includes/class-wp-terms-list-table.php	(revision 30231)
+++ wp-admin/includes/class-wp-terms-list-table.php	(working copy)
@@ -416,7 +416,7 @@
 			return;
 ?>
 
-	<form method="get" action=""><table style="display: none"><tbody id="inlineedit">
+	<form method="get"><table style="display: none"><tbody id="inlineedit">
 		<tr id="inline-edit" class="inline-edit-row" style="display: none"><td colspan="<?php echo $this->get_column_count(); ?>" class="colspanchange">
 
 			<fieldset><div class="inline-edit-col">
Index: wp-admin/includes/dashboard.php
===================================================================
--- wp-admin/includes/dashboard.php	(revision 30231)
+++ wp-admin/includes/dashboard.php	(working copy)
@@ -155,7 +155,7 @@
 }
 
 function _wp_dashboard_control_callback( $dashboard, $meta_box ) {
-	echo '<form action="" method="post" class="dashboard-widget-control-form">';
+	echo '<form method="post" class="dashboard-widget-control-form">';
 	wp_dashboard_trigger_widget_control( $meta_box['id'] );
 	wp_nonce_field( 'edit-dashboard-widget_' . $meta_box['id'], 'dashboard-widget-nonce' );
 	echo '<input type="hidden" name="widget_id" value="' . esc_attr($meta_box['id']) . '" />';
Index: wp-admin/includes/media.php
===================================================================
--- wp-admin/includes/media.php	(revision 30231)
+++ wp-admin/includes/media.php	(working copy)
@@ -2301,7 +2301,7 @@
 
 ?>
 
-<form id="filter" action="" method="get">
+<form id="filter" method="get">
 <input type="hidden" name="type" value="<?php echo esc_attr( $type ); ?>" />
 <input type="hidden" name="tab" value="<?php echo esc_attr( $tab ); ?>" />
 <input type="hidden" name="post_id" value="<?php echo (int) $post_id; ?>" />
Index: wp-admin/includes/plugin-install.php
===================================================================
--- wp-admin/includes/plugin-install.php	(revision 30231)
+++ wp-admin/includes/plugin-install.php	(working copy)
@@ -170,7 +170,7 @@
 		$input_attrs = 'class="wp-filter-search" placeholder="' . esc_attr__( 'Search Plugins' ) . '" ';
 	}
 
-	?><form class="search-form search-plugins" method="get" action="">
+	?><form class="search-form search-plugins" method="get">
 		<input type="hidden" name="tab" value="search" />
 		<?php if ( $type_selector ) : ?>
 		<select name="type" id="typeselector">
@@ -216,7 +216,7 @@
 	$user = ! empty( $_GET['user'] ) ? wp_unslash( $_GET['user'] ) : get_user_option( 'wporg_favorites' );
 	?>
 	<p class="install-help"><?php _e( 'If you have marked plugins as favorites on WordPress.org, you can browse them here.' ); ?></p>
-	<form method="get" action="">
+	<form method="get">
 		<input type="hidden" name="tab" value="favorites" />
 		<p>
 			<label for="user"><?php _e( 'Your WordPress.org username:' ); ?></label>
@@ -240,7 +240,7 @@
 	}
 
 	?>
-	<form id="plugin-filter" action="" method="post">
+	<form id="plugin-filter" method="post">
 		<?php $wp_list_table->display(); ?>
 	</form>
 	<?php
Index: wp-admin/includes/screen.php
===================================================================
--- wp-admin/includes/screen.php	(revision 30231)
+++ wp-admin/includes/screen.php	(working copy)
@@ -1023,7 +1023,7 @@
 
 		?>
 		<div id="screen-options-wrap" class="hidden" tabindex="-1" aria-label="<?php esc_attr_e('Screen Options Tab'); ?>">
-		<form id="adv-settings" action="" method="post">
+		<form id="adv-settings" method="post">
 		<?php if ( isset( $wp_meta_boxes[ $this->id ] ) || $this->get_option( 'per_page' ) || ( $columns && empty( $columns['_title'] ) ) ) : ?>
 			<h5><?php _e( 'Show on screen' ); ?></h5>
 		<?php
Index: wp-admin/includes/template.php
===================================================================
--- wp-admin/includes/template.php	(revision 30231)
+++ wp-admin/includes/template.php	(working copy)
@@ -432,7 +432,7 @@
 	}
 
 ?>
-<form method="get" action="">
+<form method="get">
 <?php if ( $table_row ) : ?>
 <table style="display:none;"><tbody id="com-reply"><tr id="replyrow" style="display:none;"><td colspan="<?php echo $wp_list_table->get_column_count(); ?>" class="colspanchange">
 <?php else : ?>
Index: wp-admin/includes/theme-install.php
===================================================================
--- wp-admin/includes/theme-install.php	(revision 30231)
+++ wp-admin/includes/theme-install.php	(working copy)
@@ -57,7 +57,7 @@
 	if ( ! $type_selector )
 		echo '<p class="install-help">' . __( 'Search for themes by keyword.' ) . '</p>';
 	?>
-<form id="search-themes" method="get" action="">
+<form id="search-themes" method="get">
 	<input type="hidden" name="tab" value="search" />
 	<?php if ( $type_selector ) : ?>
 	<label class="screen-reader-text" for="typeselector"><?php _e('Type of search'); ?></label>
@@ -99,7 +99,7 @@
 <h4><?php _e('Feature Filter') ?></h4>
 <p class="install-help"><?php _e( 'Find a theme based on specific features.' ); ?></p>
 
-<form method="get" action="">
+<form method="get">
 	<input type="hidden" name="tab" value="search" />
 	<?php
 	$feature_list = get_theme_feature_list();
Index: wp-admin/includes/widgets.php
===================================================================
--- wp-admin/includes/widgets.php	(revision 30231)
+++ wp-admin/includes/widgets.php	(working copy)
@@ -205,7 +205,7 @@
 	</div>
 
 	<div class="widget-inside">
-	<form action="" method="post">
+	<form method="post">
 	<div class="widget-content">
 <?php
 	if ( isset($control['callback']) )
Index: wp-admin/link-manager.php
===================================================================
--- wp-admin/link-manager.php	(revision 30231)
+++ wp-admin/link-manager.php	(working copy)
@@ -84,7 +84,7 @@
 }
 ?>
 
-<form id="posts-filter" action="" method="get">
+<form id="posts-filter" method="get">
 
 <?php $wp_list_table->search_box( __( 'Search Links' ), 'link' ); ?>
 
Index: wp-admin/media.php
===================================================================
--- wp-admin/media.php	(revision 30231)
+++ wp-admin/media.php	(working copy)
@@ -111,7 +111,7 @@
 <?php } ?>
 </h2>
 
-<form method="post" action="" class="media-upload-form" id="media-single-form">
+<form method="post" class="media-upload-form" id="media-single-form">
 <p class="submit" style="padding-bottom: 0;">
 <?php submit_button( __( 'Update Media' ), 'primary', 'save', false ); ?>
 </p>
Index: wp-admin/my-sites.php
===================================================================
--- wp-admin/my-sites.php	(revision 30231)
+++ wp-admin/my-sites.php	(working copy)
@@ -64,7 +64,7 @@
 	echo '</p>';
 else :
 ?>
-<form id="myblogs" action="" method="post">
+<form id="myblogs" method="post">
 	<?php
 	choose_primary_blog();
 	/**
Index: wp-admin/nav-menus.php
===================================================================
--- wp-admin/nav-menus.php	(revision 30231)
+++ wp-admin/nav-menus.php	(working copy)
@@ -684,7 +684,7 @@
 
 		<div class="clear"></div>
 
-		<form id="nav-menu-meta" action="" class="nav-menu-meta" method="post" enctype="multipart/form-data">
+		<form id="nav-menu-meta" class="nav-menu-meta" method="post" enctype="multipart/form-data">
 			<input type="hidden" name="menu" id="nav-menu-meta-object-id" value="<?php echo esc_attr( $nav_menu_selected_id ); ?>" />
 			<input type="hidden" name="action" value="add-menu-item" />
 			<?php wp_nonce_field( 'add-menu_item', 'menu-settings-column-nonce' ); ?>
@@ -694,7 +694,7 @@
 	</div><!-- /#menu-settings-column -->
 	<div id="menu-management-liquid">
 		<div id="menu-management">
-			<form id="update-nav-menu" action="" method="post" enctype="multipart/form-data">
+			<form id="update-nav-menu" method="post" enctype="multipart/form-data">
 				<div class="menu-edit <?php if ( $add_new_screen ) echo 'blank-slate'; ?>">
 					<?php
 					wp_nonce_field( 'closedpostboxes', 'closedpostboxesnonce', false );
Index: wp-admin/network/site-themes.php
===================================================================
--- wp-admin/network/site-themes.php	(revision 30231)
+++ wp-admin/network/site-themes.php	(working copy)
@@ -167,7 +167,7 @@
 
 <p><?php _e( 'Network enabled themes are not shown on this screen.' ) ?></p>
 
-<form method="get" action="">
+<form method="get">
 <?php $wp_list_table->search_box( __( 'Search Installed Themes' ), 'theme' ); ?>
 <input type="hidden" name="id" value="<?php echo esc_attr( $id ) ?>" />
 </form>
Index: wp-admin/network/site-users.php
===================================================================
--- wp-admin/network/site-users.php	(revision 30231)
+++ wp-admin/network/site-users.php	(working copy)
@@ -235,7 +235,7 @@
 	}
 endif; ?>
 
-<form class="search-form" action="" method="get">
+<form class="search-form" method="get">
 <?php $wp_list_table->search_box( __( 'Search Users' ), 'user' ); ?>
 <input type="hidden" name="id" value="<?php echo esc_attr( $id ) ?>" />
 </form>
Index: wp-admin/network/sites.php
===================================================================
--- wp-admin/network/sites.php	(revision 30231)
+++ wp-admin/network/sites.php	(working copy)
@@ -261,7 +261,7 @@
 
 <?php echo $msg; ?>
 
-<form action="" method="get" id="ms-search">
+<form method="get" id="ms-search">
 <?php $wp_list_table->search_box( __( 'Search Sites' ), 'site' ); ?>
 <input type="hidden" name="action" value="blogs" />
 </form>
Index: wp-admin/network/users.php
===================================================================
--- wp-admin/network/users.php	(revision 30231)
+++ wp-admin/network/users.php	(working copy)
@@ -284,7 +284,7 @@
 
 	<?php $wp_list_table->views(); ?>
 
-	<form action="" method="get" class="search-form">
+	<form method="get" class="search-form">
 		<?php $wp_list_table->search_box( __( 'Search Users' ), 'all-user' ); ?>
 	</form>
 
Index: wp-admin/network.php
===================================================================
--- wp-admin/network.php	(revision 30231)
+++ wp-admin/network.php	(working copy)
@@ -179,7 +179,7 @@
 		die();
 	}
 
-	echo '<form method="post" action="">';
+	echo '<form method="post">';
 
 	wp_nonce_field( 'install-network-1' );
 
Index: wp-admin/plugins.php
===================================================================
--- wp-admin/plugins.php	(revision 30231)
+++ wp-admin/plugins.php	(working copy)
@@ -456,11 +456,11 @@
 
 <?php $wp_list_table->views(); ?>
 
-<form method="get" action="">
+<form method="get">
 <?php $wp_list_table->search_box( __( 'Search Installed Plugins' ), 'plugin' ); ?>
 </form>
 
-<form method="post" action="">
+<form method="post">
 
 <input type="hidden" name="plugin_status" value="<?php echo esc_attr($status) ?>" />
 <input type="hidden" name="paged" value="<?php echo esc_attr($page) ?>" />
Index: wp-admin/upload.php
===================================================================
--- wp-admin/upload.php	(revision 30231)
+++ wp-admin/upload.php	(working copy)
@@ -277,7 +277,7 @@
 <div id="message" class="updated"><p><?php echo $message; ?></p></div>
 <?php } ?>
 
-<form id="posts-filter" action="" method="get">
+<form id="posts-filter" method="get">
 
 <?php $wp_list_table->views(); ?>
 
Index: wp-admin/user-new.php
===================================================================
--- wp-admin/user-new.php	(revision 30231)
+++ wp-admin/user-new.php	(working copy)
@@ -287,7 +287,7 @@
  * @since 3.0.0
  */
 ?>
-<form action="" method="post" name="adduser" id="adduser" class="validate" novalidate="novalidate"<?php do_action( 'user_new_form_tag' );?>>
+<form method="post" name="adduser" id="adduser" class="validate" novalidate="novalidate"<?php do_action( 'user_new_form_tag' );?>>
 <input name="action" type="hidden" value="adduser" />
 <?php wp_nonce_field( 'add-user', '_wpnonce_add-user' ) ?>
 
@@ -335,7 +335,7 @@
 ?>
 <p><?php _e('Create a brand new user and add them to this site.'); ?></p>
 <?php /** This action is documented in wp-admin/user-new.php */ ?>
-<form action="" method="post" name="createuser" id="createuser" class="validate" novalidate="novalidate"<?php do_action( 'user_new_form_tag' );?>>
+<form method="post" name="createuser" id="createuser" class="validate" novalidate="novalidate"<?php do_action( 'user_new_form_tag' );?>>
 <input name="action" type="hidden" value="createuser" />
 <?php wp_nonce_field( 'create-user', '_wpnonce_create-user' ); ?>
 <?php
Index: wp-admin/users.php
===================================================================
--- wp-admin/users.php	(revision 30231)
+++ wp-admin/users.php	(working copy)
@@ -209,7 +209,7 @@
 
 	include( ABSPATH . 'wp-admin/admin-header.php' );
 ?>
-<form action="" method="post" name="updateusers" id="updateusers">
+<form method="post" name="updateusers" id="updateusers">
 <?php wp_nonce_field('delete-users') ?>
 <?php echo $referer; ?>
 
@@ -321,7 +321,7 @@
 
 	include( ABSPATH . 'wp-admin/admin-header.php' );
 ?>
-<form action="" method="post" name="updateusers" id="updateusers">
+<form method="post" name="updateusers" id="updateusers">
 <?php wp_nonce_field('remove-users') ?>
 <?php echo $referer; ?>
 
@@ -443,7 +443,7 @@
 
 <?php $wp_list_table->views(); ?>
 
-<form action="" method="get">
+<form method="get">
 
 <?php $wp_list_table->search_box( __( 'Search Users' ), 'user' ); ?>
 
Index: wp-admin/widgets.php
===================================================================
--- wp-admin/widgets.php	(revision 30231)
+++ wp-admin/widgets.php	(working copy)
@@ -417,7 +417,7 @@
 </div>
 </div>
 </div>
-<form action="" method="post">
+<form method="post">
 <?php wp_nonce_field( 'save-sidebar-widgets', '_wpnonce_widgets', false ); ?>
 </form>
 <br class="clear" />
Index: wp-includes/class-wp-customize-widgets.php
===================================================================
--- wp-includes/class-wp-customize-widgets.php	(revision 30231)
+++ wp-includes/class-wp-customize-widgets.php	(working copy)
@@ -952,7 +952,7 @@
 
 		call_user_func_array( 'wp_widget_control', $args );
 		$replacements = array(
-			'<form action="" method="post">' => '<div class="form">',
+			'<form method="post">' => '<div class="form">',
 			'</form>' => '</div><!-- .form -->',
 		);