Index: src/wp-admin/options-privacy.php
===================================================================
--- src/wp-admin/options-privacy.php	(revision 57271)
+++ src/wp-admin/options-privacy.php	(working copy)
@@ -270,7 +270,7 @@
 				</label>
 			</th>
 			<td>
-				<form class="wp-create-privacy-page" method="post" action="">
+				<form class="wp-create-privacy-page" method="post">
 					<input type="hidden" name="action" value="create-privacy-page" />
 					<?php
 					wp_nonce_field( 'create-privacy-page' );
@@ -293,7 +293,7 @@
 				</label>
 			</th>
 			<td>
-				<form method="post" action="">
+				<form method="post">
 					<input type="hidden" name="action" value="set-privacy-page" />
 					<?php
 					wp_dropdown_pages(
Index: src/wp-admin/widgets-form.php
===================================================================
--- src/wp-admin/widgets-form.php	(revision 57271)
+++ src/wp-admin/widgets-form.php	(working copy)
@@ -478,7 +478,7 @@
 
 				<?php if ( $is_inactive_widgets ) { ?>
 				<div class="remove-inactive-widgets">
-					<form action="" method="post">
+					<form method="post">
 						<p>
 							<?php
 							$attributes = array( 'id' => 'inactive-widgets-control-remove' );
Index: src/wp-login.php
===================================================================
--- src/wp-login.php	(revision 57271)
+++ src/wp-login.php	(working copy)
@@ -364,7 +364,7 @@
 		if ( ! empty( $languages ) ) {
 			?>
 			<div class="language-switcher">
-				<form id="language-switcher" action="" method="get">
+				<form id="language-switcher" method="get">
 
 					<label for="language-switcher-locales">
 						<span class="dashicons dashicons-translation" aria-hidden="true"></span>