Extractvalue(1,concat(char(126),md5(1729888217))) Online

: This joins the tilde with the MD5 hash (e.g., ~2336333435343461... ).

Instead of "developing" this as a feature, you should ensure your application is protected against it: extractvalue(1,concat(char(126),md5(1729888217)))

The payload is designed to force the database to throw an error message that contains the result of a specific command (in this case, an MD5 hash). : This joins the tilde with the MD5 hash (e

: This function is meant to extract data from XML. However, since the concatenated string (starting with ~ ) is not a valid XPath, MySQL throws an XPATH syntax error . The Result extractvalue(1,concat(char(126),md5(1729888217)))