diff --git a/src/wp-admin/includes/class-custom-image-header.php b/src/wp-admin/includes/class-custom-image-header.php
index a4b04bf3fc..5c3271478b 100644
--- a/src/wp-admin/includes/class-custom-image-header.php
+++ b/src/wp-admin/includes/class-custom-image-header.php
@@ -934,7 +934,7 @@ endif;
 	<p class="hide-if-js"><strong><?php _e( 'You need JavaScript to choose a part of the image.' ); ?></strong></p>
 
 	<div id="crop_image" style="position: relative">
-		<img src="<?php echo esc_url( $url ); ?>" id="upload" width="<?php echo $width; ?>" height="<?php echo $height; ?>" alt="" />
+		<img src="<?php echo esc_url( $url ); ?>" id="upload" width="<?php echo esc_attr( $width ); ?>" height="<?php echo esc_attr( $height ); ?>" alt="" />
 	</div>
 
 	<input type="hidden" name="x1" id="x1" value="0" />