You're not doing any input validation. Please pull down this hack until you can safely ensure that all input is validated. Please see the examples in imageize and urlize.
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.