With AtEoaT, "security" concerns anything from this list, and possibly more:

• Duplication bugs (copying an item via use of an exploit)
• Account hijacking bugs (taking over someone elses account)
• Character hijacking bugs (taking over someone elses characters)
• Oat bugs (anything related to the buying of oats)
• Crash bugs (anything that crashes the game)

If you find something so serious that other players should not know about it, email me at [email protected]. I will likely respond within a few days at most and be working on a fix within a week.