Zen Cart contains a flaw that may allow an attacker to carry out an SQL injection attack. The issue is due to unspecified script(s) not properly sanitizing user-supplied input to unspecified variable(s). This may allow an attacker to inject or manipulate SQL queries in the back-end database.
Upgrade to version 1.2.7 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.