diff --git a/src/channel/chat.js b/src/channel/chat.js
index 5c44df41..16204089 100644
--- a/src/channel/chat.js
+++ b/src/channel/chat.js
@@ -342,7 +342,8 @@ ChatModule.prototype.filterMessage = function (msg) {
         if (filtered !== link) {
             return filtered;
         } else if (convertLinks) {
-            return "<a href=\"" + link + "\" target=\"_blank\">" + link + "</a>";
+            return "<a href=\"" + link + "\" target=\"_blank\" " +
+                    "rel=\"noopener noreferrer\">" + link + "</a>";
         } else {
             return link;
         }
diff --git a/src/xss.js b/src/xss.js
index 4ebe3876..5c3fe3c8 100644
--- a/src/xss.js
+++ b/src/xss.js
@@ -29,7 +29,8 @@ const ALLOWED_ATTRIBUTES = [
     "style",
     "title",
     "valign",
-    "width"
+    "width",
+    "rel"
 ];
 
 const ALLOWED_SCHEMES = [