diff --git a/mysql-test/suite/sysschema/r/pr_create_synonym_db.result b/mysql-test/suite/sysschema/r/pr_create_synonym_db.result
index bd7e4edc6e6..8c0e8dfa957 100644
--- a/mysql-test/suite/sysschema/r/pr_create_synonym_db.result
+++ b/mysql-test/suite/sysschema/r/pr_create_synonym_db.result
@@ -50,3 +50,17 @@ DROP TABLE test.t1;
 DROP TABLE test.t2;
 DROP TABLE `is`;
 DROP TABLE `ab``c`;
+#
+# MDEV-28342: sys.create_synonym_db fails
+#             when a temporary table masks a base table
+#
+create database db;
+use db;
+create table a(a int);
+create table t (b int);
+create table b(a int);
+create temporary table b (a int);
+call sys.create_synonym_db('db','db_copy');
+ERROR HY000: Table`db`.`b`shadows base table. View cannot be created! Terminating!
+drop database db;
+drop database db_copy;
diff --git a/mysql-test/suite/sysschema/t/pr_create_synonym_db.test b/mysql-test/suite/sysschema/t/pr_create_synonym_db.test
index 4fbe8759380..30c6f502e30 100644
--- a/mysql-test/suite/sysschema/t/pr_create_synonym_db.test
+++ b/mysql-test/suite/sysschema/t/pr_create_synonym_db.test
@@ -50,3 +50,20 @@ DROP TABLE test.t1;
 DROP TABLE test.t2;
 DROP TABLE `is`;
 DROP TABLE `ab``c`;
+
+--echo #
+--echo # MDEV-28342: sys.create_synonym_db fails
+--echo #             when a temporary table masks a base table
+--echo #
+
+create database db;
+use db;
+create table a(a int);
+create table t (b int);
+create table b(a int);
+create temporary table b (a int);
+--error ER_SIGNAL_EXCEPTION
+call sys.create_synonym_db('db','db_copy');
+
+drop database db;
+drop database db_copy;
diff --git a/scripts/sys_schema/procedures/create_synonym_db.sql b/scripts/sys_schema/procedures/create_synonym_db.sql
index 703ec9bff3b..e373a9b4ee6 100644
--- a/scripts/sys_schema/procedures/create_synonym_db.sql
+++ b/scripts/sys_schema/procedures/create_synonym_db.sql
@@ -97,9 +97,8 @@ BEGIN
     DECLARE v_db_err_msg TEXT;
     DECLARE v_table VARCHAR(64);
     DECLARE v_views_created INT DEFAULT 0;
-
-    DECLARE db_doesnt_exist CONDITION FOR SQLSTATE '42000';
-    DECLARE db_name_exists CONDITION FOR SQLSTATE 'HY000';
+    DECLARE v_table_exists ENUM('', 'BASE TABLE', 'VIEW', 'TEMPORARY') DEFAULT '';
+    DECLARE v_temp_table TEXT;
 
     DECLARE c_table_names CURSOR FOR 
         SELECT TABLE_NAME 
@@ -144,6 +143,21 @@ BEGIN
             LEAVE c_table_names;
         END IF;
 
+    -- Check does temporary table shadows the base table. If it is so, terminate.
+        CALL sys.table_exists(in_db_name, v_table, v_table_exists);
+        IF (v_table_exists = 'TEMPORARY') THEN
+            SET v_temp_table =
+            CONCAT(
+                'Table',
+                 sys.quote_identifier(in_db_name),
+                 '.',
+                 sys.quote_identifier(v_table),
+                 'shadows base table. View cannot be created! Terminating!');
+             SIGNAL SQLSTATE 'HY000'
+                 SET MESSAGE_TEXT = v_temp_table;
+             LEAVE c_table_names;
+        END IF;
+
         SET @create_view_stmt = CONCAT(
             'CREATE SQL SECURITY INVOKER VIEW ',
             sys.quote_identifier(in_synonym),