Web-based gradebook that allows teachers to save time, communicate with parents, increase student performance, and improve school management.
EDIT: The following now only works with links and basic text formatting. It's still an issue, but not as critical now.
Using specially crafted URLs one can perform an XSS attack on the Email Logs page (when signed in).
For example, http://www.teacherease.com/parents/EmailLogViewAll.aspx?infomessage=%3Ciframe%20width=1000%20height=500%20src=%27https://www.google.com/%27%3E%3C/iframe%3E shows Google in an embedded iframe.
Using NoScript will protect against this attack.
My school used this last year, but now switched to renweb. I extremely dislike renweb, do not use renweb, teacher-ease is far superior.