Opera users must upgrade to 8.51
Insufficient quoting of shell meta characters in the opera start script allowed to execute arbitrary commands if URLs with such characters were passed to the script
The excellent light-weight web browser Opera newly removed the advertisement banners for non-paying users and that made it very popular.
It is also very good for users of all abilities because of it's built-in voice capabilities and zooming features.
Versions prior to 8.51 allows arbitrary commands to be executed. This can be potentially be extremely bad, so if you are using a Opera version prior to 8.5 then upgrading Opera is a very good idea.
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