From 8eeccbf75dcc097dfadcdd87b222652c94973724 Mon Sep 17 00:00:00 2001
From: audrasjb <audrasjb@git.wordpress.org>
Date: Mon, 24 Jun 2024 15:44:28 +0000
Subject: [PATCH] Editor: Fix Path Traversal issue on Windows in Template-Part
 Block.

Merges [58470] to the 4.9 branch.
Props xknown, jorbin.



Built from https://develop.svn.wordpress.org/branches/4.9@58493


git-svn-id: http://core.svn.wordpress.org/branches/4.9@57942 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/functions.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index 722cdea4c6..71536cf612 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -4312,6 +4312,9 @@ function iis7_supports_permalinks() {
  * @return int 0 means nothing is wrong, greater than 0 means something was wrong.
  */
 function validate_file( $file, $allowed_files = array() ) {
+	// Normalize path for Windows servers
+	$file = wp_normalize_path( $file );
+
 	// `../` on its own is not allowed:
 	if ( '../' === $file ) {
 		return 1;