A SQL Injection vulnerability exists in the product.php page of PuneethReddyHC Online Shopping System Advanced 1.0. This flaw is present in the product_id GET parameter, which is not properly validated before being included in a SQL statement.
The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Without sufficient removal or quoting of SQL syntax in user-controllable inputs, the generated SQL query can cause those inputs to be interpreted as SQL instead of ordinary user data.