From 2e3e405fdbb0c9f9ad5ded74580b9a88c22c4cbb Mon Sep 17 00:00:00 2001
From: Sergey Biryukov <sergeybiryukov@git.wordpress.org>
Date: Mon, 21 May 2018 12:39:54 +0000
Subject: [PATCH] Comments: Escape permalink values on edit screen to prevent
 XSS.

There doesn't appear to be any way for an attacker to introduce malicious input into the URL, unless a plugin is filtering the URL to add it, but it's better to be safe than sorry.

Props 1naveengiri, joyously.
Merges [43290] to the 4.9 branch.
Fixes #44115.

git-svn-id: https://develop.svn.wordpress.org/branches/4.9@43301 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-admin/edit-form-comment.php | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/wp-admin/edit-form-comment.php b/src/wp-admin/edit-form-comment.php
index 2ae7957f72..651ff15bab 100644
--- a/src/wp-admin/edit-form-comment.php
+++ b/src/wp-admin/edit-form-comment.php
@@ -29,7 +29,11 @@ if ( 'approved' === wp_get_comment_status( $comment ) && $comment->comment_post_
 <div class="inside">
 	<div id="comment-link-box">
 		<strong><?php _ex( 'Permalink:', 'comment' ); ?></strong>
-		<span id="sample-permalink"><a href="<?php echo $comment_link; ?>"><?php echo $comment_link; ?></a></span>
+		<span id="sample-permalink">
+			<a href="<?php echo esc_url( $comment_link ); ?>">
+				<?php echo esc_html( $comment_link ); ?>
+			</a>
+		</span>
 	</div>
 </div>
 <?php endif; ?>