Forgot to specify versions:

PHP 7.1.13

Roundcube 1.3.4

From: users-bounces@lists.roundcube.net [mailto:users-bounces@lists.roundcube.net] On Behalf Of Jorge Bastos
Sent: 23 de fevereiro de 2018 09:28
To: 'Roundcube Users mailing list' <users@lists.roundcube.net>
Subject: [RCU] Request security check failed

Howdy,

I’ve been seen this info in the logs, and my question is, is this some sort of hack attempt, or should not care about?

Jorge,

==

Feb 22 19:36:52 fastweb roundcube: <h9lj7u9d> PHP Error: Request security check failed (GET /webmail/?_task=logout&_token=4gqJNrvLh3TYhjN4dYxEcV8pba8oT6Q8)