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ABAP Keyword Documentation →  ABAP - Security Notes →  Further Security Risks 

Cross-Client Database Access

Each client is a self-contained unit. The automatic client handling in Open SQL function ensures that application programs can only access the business data in the current client. In Open SQL, switching off automatic client handling using the addition CLIENT SPECIFIED or switching to a different client using the addition USING CLIENT can be considered as access to foreign data that is critical for security.

In Native SQL, there is no automatic client handling and the client in question must be specified explicitly in the access conditions. Here, specifying a client other than the current client entails accessing foreign data.

Cross-client access to database tables is permitted only in system programs in the system client .

Other versions: 7.31 | 7.40 | 7.54


See also the programming guidelines for client handling.


The following program excerpts permit a user to access customer data in any client. This should be avoided at all costs.

DATA client TYPE sy-mandt. 
client = sy-mandt. 
cl_demo_input=>request( CHANGING field = client ). 

       FROM scustom USING CLIENT @client 
       INTO TABLE @DATA(customers1). 
cl_demo_output=>display( customers1 ). 

       WHERE mandt = @client 
       INTO TABLE @DATA(customers2). 
cl_demo_output=>display( customers2 ).