XF 1.1 Upload Security error occurred

Jake Bunce

XenForo moderator
Staff member
Does the error happen every time?

Some guesses:

1) You were idle for too long before submitting the form.

2) You are running suhosin (hardened php). Suhosin can truncate form submissions if limits are exceeded. If the security token is truncated it will result in this error.

3) An addon or customization that is misbehaving.