diff --git a/CTFd/utils/security/sanitize.py b/CTFd/utils/security/sanitize.py
index 3098d24a..86aa9788 100644
--- a/CTFd/utils/security/sanitize.py
+++ b/CTFd/utils/security/sanitize.py
@@ -5,6 +5,7 @@ from lxml.html.clean import Cleaner  # nosec B410
 from lxml.html.defs import safe_attrs  # nosec B410
 
 cleaner = Cleaner(
+    comments=False,
     page_structure=False,
     embedded=False,
     frames=False,