diff --git a/frappe/desk/doctype/custom_html_block/custom_html_block.py b/frappe/desk/doctype/custom_html_block/custom_html_block.py
index 837fcb3079..5a4df25453 100644
--- a/frappe/desk/doctype/custom_html_block/custom_html_block.py
+++ b/frappe/desk/doctype/custom_html_block/custom_html_block.py
@@ -4,6 +4,7 @@
 import frappe
 from frappe.model.document import Document
 from frappe.query_builder.utils import DocType
+from frappe.utils import has_common
 
 
 class CustomHTMLBlock(Document):
@@ -23,7 +24,12 @@ class CustomHTMLBlock(Document):
 		style: DF.Code | None
 	# end: auto-generated types
 
-	pass
+	def validate(self):
+		self.validate_private()
+
+	def validate_private(self):
+		if not has_common(frappe.get_roles(), ["Administrator", "System Manager", "Workspace Manager"]):
+			self.private = 1
 
 
 @frappe.whitelist()