diff --git a/src/wp-admin/includes/class-wp-plugins-list-table.php b/src/wp-admin/includes/class-wp-plugins-list-table.php
index 9fb81030ef..b84ebd18c4 100644
--- a/src/wp-admin/includes/class-wp-plugins-list-table.php
+++ b/src/wp-admin/includes/class-wp-plugins-list-table.php
@@ -268,7 +268,7 @@ class WP_Plugins_List_Table extends WP_List_Table {
 	}
 
 	/**
-	 * @global string $s
+	 * @global string $s URL encoded search term.
 	 *
 	 * @param array $plugin
 	 * @return bool
@@ -277,7 +277,7 @@ class WP_Plugins_List_Table extends WP_List_Table {
 		global $s;
 
 		foreach ( $plugin as $value ) {
-			if ( is_string( $value ) && false !== stripos( strip_tags( $value ), $s ) ) {
+			if ( is_string( $value ) && false !== stripos( strip_tags( $value ), urldecode( $s ) ) ) {
 				return true;
 			}
 		}
@@ -316,7 +316,7 @@ class WP_Plugins_List_Table extends WP_List_Table {
 		global $plugins;
 
 		if ( ! empty( $_REQUEST['s'] ) ) {
-			$s = esc_html( $_REQUEST['s'] );
+			$s = esc_html( wp_unslash( $_REQUEST['s'] ) );
 
 			printf( __( 'No plugins found for “%s”.' ), $s );
 
diff --git a/src/wp-admin/plugins.php b/src/wp-admin/plugins.php
index a55001e253..472c5507cf 100644
--- a/src/wp-admin/plugins.php
+++ b/src/wp-admin/plugins.php
@@ -18,7 +18,7 @@ $pagenum = $wp_list_table->get_pagenum();
 $action = $wp_list_table->current_action();
 
 $plugin = isset($_REQUEST['plugin']) ? $_REQUEST['plugin'] : '';
-$s = isset($_REQUEST['s']) ? urlencode($_REQUEST['s']) : '';
+$s = isset($_REQUEST['s']) ? urlencode( wp_unslash( $_REQUEST['s'] ) ) : '';
 
 // Clean up request URI from temporary args for screen options/paging uri's to work as expected.
 $_SERVER['REQUEST_URI'] = remove_query_arg(array('error', 'deleted', 'activate', 'activate-multi', 'deactivate', 'deactivate-multi', '_error_nonce'), $_SERVER['REQUEST_URI']);
@@ -486,7 +486,7 @@ if ( ( ! is_multisite() || is_network_admin() ) && current_user_can('install_plu
 
 if ( strlen( $s ) ) {
 	/* translators: %s: search keywords */
-	printf( '<span class="subtitle">' . __( 'Search results for &#8220;%s&#8221;' ) . '</span>', esc_html( $s ) );
+	printf( '<span class="subtitle">' . __( 'Search results for &#8220;%s&#8221;' ) . '</span>', esc_html( urldecode( $s ) ) );
 }
 ?>
 </h1>