diff --git a/web/react/utils/markdown.jsx b/web/react/utils/markdown.jsx
index 2b1aed9c063d..63ea3095d3e2 100644
--- a/web/react/utils/markdown.jsx
+++ b/web/react/utils/markdown.jsx
@@ -196,7 +196,7 @@ class MattermostMarkdownRenderer extends marked.Renderer {
         try {
             const unescaped = decodeURIComponent(unescape(href)).replace(/[^\w:]/g, '').toLowerCase();
 
-            if (unescaped.indexOf('javascript:') === 0 || unescaped.indexOf('vbscript:') === 0) { // eslint-disable-line no-script-url
+            if (unescaped.indexOf('javascript:') === 0 || unescaped.indexOf('vbscript:') === 0 || unescaped.indexOf('data:') === 0) { // eslint-disable-line no-script-url
                 return '';
             }
         } catch (e) {