Multiple SQL injection vulnerabilities in Zen Cart 1.3.0.2 and earlier allow remote attackers to execute arbitrary SQL commands via (1) GPC data to the ipn_get_stored_session function in ipn_main_handler.php, which can be leveraged to modify elements of $_SESSION; and allow remote authenticated users to execute arbitrary SQL commands via (2) a session id within a cookie to whos_online_session_recreate, (3) the quantity field to the add_cart function, (4) an id[] parameter when adding an item to a shopping cart, or (5) a redemption code when checking out (dc_redeem_code parameter to includes/modules/order_total/ot_coupon.php).
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