source: https://www.securityfocus.com/bid/66536/info

Symphony is prone to a cross-site request-forgery vulnerability.

An attacker can exploit the cross-site request forgery issue to perform unauthorized actions in the context of a logged-in user of the affected application. This may aid in other attacks.

Symphony version 2.3.1 and prior are vulnerable. 

<img src="http://www.example.com/symphony/system/authors/?order=asc&sort=id%20INTO%20OUTFILE%20%27/var/www/file.txt%27%20--%20">