diff --git a/public/js/extra.js b/public/js/extra.js
index d6bbb0c..7a1077d 100644
--- a/public/js/extra.js
+++ b/public/js/extra.js
@@ -570,7 +570,9 @@ export function postProcess (code) {
$(value).html(html)
})
// link should open in new window or tab
- result.find('a:not([href^="#"]):not([target])').attr('target', '_blank')
+ // also add noopener to prevent clickjacking
+ // See details: https://mathiasbynens.github.io/rel-noopener/
+ result.find('a:not([href^="#"]):not([target])').attr('target', '_blank').attr('rel', 'noopener')
// update continue line numbers
const linenumberdivs = result.find('.gutter.linenumber').toArray()
for (let i = 0; i < linenumberdivs.length; i++) {
diff --git a/public/views/codimd/body.ejs b/public/views/codimd/body.ejs
index d4f27a9..dc11190 100644
--- a/public/views/codimd/body.ejs
+++ b/public/views/codimd/body.ejs
@@ -113,7 +113,7 @@
diff --git a/public/views/shared/refresh-modal.ejs b/public/views/shared/refresh-modal.ejs
index 5be41b2..6458054 100644
--- a/public/views/shared/refresh-modal.ejs
+++ b/public/views/shared/refresh-modal.ejs
@@ -14,7 +14,7 @@