diff --git a/opentaxii/cli/auth.py b/opentaxii/cli/auth.py
index 428b81fe..26af5afc 100644
--- a/opentaxii/cli/auth.py
+++ b/opentaxii/cli/auth.py
@@ -21,6 +21,7 @@ def create_account(argv=None):
         account = app.taxii_server.auth.api.create_account(
             username=args.username,
             password=args.password,
+            is_admin=args.admin,
         )
         token = app.taxii_server.auth.authenticate(
             username=account.username,
diff --git a/opentaxii/entities.py b/opentaxii/entities.py
index 9ff27a15..4c317e30 100644
--- a/opentaxii/entities.py
+++ b/opentaxii/entities.py
@@ -20,12 +20,12 @@ def __init__(
     def can_read(self, collection_name):
         return (
             self.is_admin or
-            self.permissions.get(collection_name) in ('read', 'modify'))
+            self.permissions.get(str(collection_name)) in ('read', 'modify'))
 
     def can_modify(self, collection_name):
         return (
             self.is_admin or
-            self.permissions.get(collection_name) == 'modify')
+            self.permissions.get(str(collection_name)) == 'modify')
 
     def __repr__(self):
         return (
diff --git a/opentaxii/taxii2/entities.py b/opentaxii/taxii2/entities.py
index e660f225..004c1ad5 100644
--- a/opentaxii/taxii2/entities.py
+++ b/opentaxii/taxii2/entities.py
@@ -66,7 +66,7 @@ def can_read(self, account: Optional[Account]):
         return self.is_public or (
             account
             and (
-                account.is_admin or "read" in set(account.permissions.get(self.id, []))
+                account.is_admin or "read" in set(account.permissions.get(str(self.id), []))
             )
         )
 
@@ -75,7 +75,7 @@ def can_write(self, account: Optional[Account]):
         return self.is_public_write or (
             account
             and (
-                account.is_admin or "write" in set(account.permissions.get(self.id, []))
+                account.is_admin or "write" in set(account.permissions.get(str(self.id), []))
             )
         )
 
diff --git a/opentaxii/taxii2/http.py b/opentaxii/taxii2/http.py
index a0408d33..989330e9 100644
--- a/opentaxii/taxii2/http.py
+++ b/opentaxii/taxii2/http.py
@@ -3,12 +3,25 @@
 from typing import Dict, Optional
 
 from flask import Response, make_response
+from uuid import UUID
+
+
+class Taxii2JSONEncoder(json.JSONEncoder):
+    """
+    Extended JSONEncoder class with additional data types support.
+    """
+    def default(self, o):
+        """Implements UUID serialization"""
+        if isinstance(o, UUID):
+            return str(o)
+
+        return super().default(o)
 
 
 def make_taxii2_response(data, status: Optional[int] = 200, extra_headers: Optional[Dict] = None) -> Response:
     """Turn input data into valid taxii2 response."""
     if not isinstance(data, str):
-        data = json.dumps(data)
+        data = json.dumps(data, cls=Taxii2JSONEncoder)
     response = make_response((data, status))
     response.content_type = "application/taxii+json;version=2.1"
     response.headers.update(extra_headers or {})