diff --git a/cms/envs/devstack.py b/cms/envs/devstack.py
index c74892fc90..39c28a37d2 100644
--- a/cms/envs/devstack.py
+++ b/cms/envs/devstack.py
@@ -314,6 +314,7 @@ CSRF_TRUSTED_ORIGINS = [
     'http://localhost:3001',  # frontend-app-library-authoring
     'http://localhost:2001',  # frontend-app-course-authoring
     'http://localhost:1992',  # frontend-app-ora
+    'http://localhost:1999',  # frontend-app-authn
 ]
 
 #################### Event bus backend ########################
diff --git a/lms/envs/devstack.py b/lms/envs/devstack.py
index 43373dabca..a1edf20198 100644
--- a/lms/envs/devstack.py
+++ b/lms/envs/devstack.py
@@ -559,6 +559,7 @@ CSRF_TRUSTED_ORIGINS = [
     'http://localhost:1992',  # frontend-app-ora
     'http://localhost:2002',  # frontend-app-discussions
     'http://localhost:1991',  # frontend-app-admin-portal
+    'http://localhost:1999',  # frontend-app-authn
 ]