Index: moodle/mod/lamslesson/userinfo.php
===================================================================
diff -u -r458edcd7121d8676f627e7f74a06952a54423bf6 -rbe217cef0f67637733d22aaa2e77c367deb9c8af
--- moodle/mod/lamslesson/userinfo.php	(.../userinfo.php)	(revision 458edcd7121d8676f627e7f74a06952a54423bf6)
+++ moodle/mod/lamslesson/userinfo.php	(.../userinfo.php)	(revision be217cef0f67637733d22aaa2e77c367deb9c8af)
@@ -17,8 +17,8 @@
     global $DB;
 
     $hs = required_param('hs', PARAM_ALPHANUM);
-    $ts = required_param('ts', PARAM_RAW);
-    $un = required_param('un', PARAM_ALPHANUM);
+    $ts = required_param('ts', PARAM_RAW_TRIMMED);
+    $un = required_param('un', PARAM_RAW_TRIMMED);    
     $lsid = optional_param('lsid', '', PARAM_INT);
 
     if(!isset($CFG->lamslesson_serverid)||!isset($CFG->lamslesson_serverkey))