Index: wp-admin/import/wordpress.php
===================================================================
--- wp-admin/import/wordpress.php	(revision 4604)
+++ wp-admin/import/wordpress.php	(working copy)
@@ -232,7 +232,7 @@
 			$post_content = str_replace('<br>', '<br />', $post_content);
 			$post_content = str_replace('<hr>', '<hr />', $post_content);
 
-			preg_match_all('|<category>(.*?)</category>|is', $post, $categories);
+			preg_match_all('|<category><..CDATA.(.*?)..></category>|is', $post, $categories);
 			$categories = $categories[1];
 
 			$cat_index = 0;