Secunia Research has discovered a vulnerability in Opera, which can be exploited by malicious people to compromise a user’s system. The vulnerability is caused due to the shell script used to launch Opera parsing shell commands that are enclosed within backticks in the URL provided via the command line. Versions below 8.51 are susceptible.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/41913/secunia-OperaCLU.txt
Source: https://packetstormsecurity.com/files/41913/secunia-OperaCLU.txt.html