diff --git a/htdocs/comm/action/class/actioncomm.class.php b/htdocs/comm/action/class/actioncomm.class.php
index 45dbbbf12c0..228ff397607 100644
--- a/htdocs/comm/action/class/actioncomm.class.php
+++ b/htdocs/comm/action/class/actioncomm.class.php
@@ -1591,16 +1591,16 @@ class ActionComm extends CommonObject
 
 		$tooltip = img_picto('', $this->picto).' <u>'.$langs->trans('Action').'</u>';
 		if (!empty($this->ref)) {
-			$tooltip .= '<br><b>'.$langs->trans('Ref').':</b> '.$this->ref;
+			$tooltip .= '<br><b>'.$langs->trans('Ref').':</b> '.dol_escape_htmltag($this->ref);
 		}
 		if (!empty($label)) {
-			$tooltip .= '<br><b>'.$langs->trans('Title').':</b> '.$label;
+			$tooltip .= '<br><b>'.$langs->trans('Title').':</b> '.dol_escape_htmltag($label);
 		}
 		if (!empty($labeltype)) {
-			$tooltip .= '<br><b>'.$langs->trans('Type').':</b> '.$labeltype;
+			$tooltip .= '<br><b>'.$langs->trans('Type').':</b> '.dol_escape_htmltag($labeltype);
 		}
 		if (!empty($this->location)) {
-			$tooltip .= '<br><b>'.$langs->trans('Location').':</b> '.$this->location;
+			$tooltip .= '<br><b>'.$langs->trans('Location').':</b> '.dol_escape_htmltag($this->location);
 		}
 		if (isset($this->transparency)) {
 			$tooltip .= '<br><b>'.$langs->trans('Busy').':</b> '.yn($this->transparency);
@@ -1609,7 +1609,7 @@ class ActionComm extends CommonObject
 			$langs->load("mails");
 			$tooltip .= '<br>';
 			//$tooltip .= '<br><b>'.img_picto('', 'email').' '.$langs->trans("Email").'</b>';
-			$tooltip .= '<br><b>'.$langs->trans('MailTopic').':</b> '.$this->email_subject;
+			$tooltip .= '<br><b>'.$langs->trans('MailTopic').':</b> '.dol_escape_htmltag($this->email_subject);
 			$tooltip .= '<br><b>'.$langs->trans('MailFrom').':</b> '.str_replace(array('<', '>'), array('&amp;lt', '&amp;gt'), $this->email_from);
 			$tooltip .= '<br><b>'.$langs->trans('MailTo').':</b> '.str_replace(array('<', '>'), array('&amp;lt', '&amp;gt'), $this->email_to);
 			if (!empty($this->email_tocc)) {
@@ -1697,7 +1697,7 @@ class ActionComm extends CommonObject
 		if ($withpicto) {
 			$result .= img_object(($notooltip ? '' : $langs->trans("ShowAction").': '.$label), ($overwritepicto ? $overwritepicto : 'action'), (($this->type_color && $overwritepicto) ? 'style="color: #'.$this->type_color.' !important;" ' : '').($notooltip ? 'class="'.(($withpicto != 2) ? 'paddingright ' : '').'"' : 'class="'.(($withpicto != 2) ? 'paddingright ' : '').'classfortooltip"'), 0, 0, $notooltip ? 0 : 1);
 		}
-		$result .= $labelshort;
+		$result .= dol_escape_htmltag($labelshort);
 		$result .= $linkend;
 
 		global $action;
diff --git a/htdocs/comm/action/index.php b/htdocs/comm/action/index.php
index f46b0adc3cb..bfb5ca991b9 100644
--- a/htdocs/comm/action/index.php
+++ b/htdocs/comm/action/index.php
@@ -1272,9 +1272,9 @@ if (count($listofextcals)) {
 					$event->datef = $dateend + $usertime;
 
 					if ($icalevent['SUMMARY']) {
-						$event->label = $icalevent['SUMMARY'];
+						$event->label = dol_string_nohtmltag($icalevent['SUMMARY']);
 					} elseif ($icalevent['DESCRIPTION']) {
-						$event->label = dol_nl2br($icalevent['DESCRIPTION'], 1);
+						$event->label = dol_nl2br(dol_string_nohtmltag($icalevent['DESCRIPTION']), 1);
 					} else {
 						$event->label = $langs->trans("ExtSiteNoLabel");
 					}
@@ -1985,7 +1985,7 @@ function show_day_events($db, $day, $month, $year, $monthshown, $style, &$eventa
 
 						// Show title
 						$titletoshow = $daterange;
-						$titletoshow .= ($titletoshow ? ' ' : '').($event->label ? $event->label : $event->libelle);
+						$titletoshow .= ($titletoshow ? ' ' : '').dol_escape_htmltag($event->label ? $event->label : $event->libelle);
 
 						if ($event->type_code != 'ICALEVENT') {
 							$savlabel = $event->label ? $event->label : $event->libelle;