diff --git a/server/router/api/v1/acl_config.go b/server/router/api/v1/acl_config.go
index 522fd2db6..4569e82b9 100644
--- a/server/router/api/v1/acl_config.go
+++ b/server/router/api/v1/acl_config.go
@@ -18,6 +18,7 @@ var PublicMethods = map[string]struct{}{
 	"/memos.api.v1.InstanceService/GetInstanceSetting": {},
 
 	// User Service - public user profiles and stats
+	"/memos.api.v1.UserService/CreateUser":       {}, // Allow first user registration
 	"/memos.api.v1.UserService/GetUser":          {},
 	"/memos.api.v1.UserService/GetUserAvatar":    {},
 	"/memos.api.v1.UserService/GetUserStats":     {},
diff --git a/server/router/api/v1/acl_config_test.go b/server/router/api/v1/acl_config_test.go
index 17f3c240f..7086ce837 100644
--- a/server/router/api/v1/acl_config_test.go
+++ b/server/router/api/v1/acl_config_test.go
@@ -16,6 +16,7 @@ func TestPublicMethodsArePublic(t *testing.T) {
 		"/memos.api.v1.InstanceService/GetInstanceProfile",
 		"/memos.api.v1.InstanceService/GetInstanceSetting",
 		// User Service
+		"/memos.api.v1.UserService/CreateUser",
 		"/memos.api.v1.UserService/GetUser",
 		"/memos.api.v1.UserService/GetUserAvatar",
 		"/memos.api.v1.UserService/GetUserStats",