- Fix possible messages exposure when using Roundcube behind a proxy (#1486281)

CHANGELOG

@@ -1,6 +1,7 @@
 CHANGELOG RoundCube Webmail
 ===========================
 
+- Fix possible messages exposure when using Roundcube behind a proxy (#1486281)
 - Fix unicode para and line separators in javascript response (#1486310)
 - additional_message_headers: allow unsetting headers, support plugin's config file (#1486268)
 - Fix displaying of hidden directories in skins list (#1486301)

program/include/rcube_shared.inc

@@ -93,7 +93,7 @@ function send_modified_header($mdate, $etag=null, $skip_check=false)
   else
     header("Last-Modified: ".gmdate("D, d M Y H:i:s", $mdate)." GMT");
   
-  header("Cache-Control: max-age=0");
+  header("Cache-Control: private, must-revalidate, max-age=0");
   header("Expires: ");
   header("Pragma: ");