OTRS reports:
An attacker who is logged into OTRS as an agent can request special URLs
from OTRS which can lead to the execution of shell commands with the
permissions of the web server user.
An attacker who is logged into OTRS as a customer can use the ticket search
form to disclose internal article information of their customer tickets.
An attacker who is logged into OTRS as an agent can manipulate form
parameters and execute arbitrary shell commands with the permissions of the
OTRS or web server user.
An attacker can send a specially prepared email to an OTRS system. If this
system has cookie support disabled, and a logged in agent clicks a link in this
email, the session information could be leaked to external systems, allowing the
attacker to take over the agent’s session.