Cross-site scripting (XSS) vulnerability in the validation feature in Macromedia ColdFusion 5 and earlier allows remote attackers to inject arbitrary web script or HTML via a "required" field when the associated normal field is missing or empty, which is not sanitized before being presented in an error message.

Macromedia ColdFusion MX before 6.1 does not restrict the size of error messages, which allows remote attackers to cause a denial of service (memory consumption and crash) by sending repeated GET or POST requests that trigger error messages that use long strings of data.