CGI::Session contains a flaw that may allow a malicious local user to overwrite arbitrary files on the system. The issue is due to the Driver::File, Driver::db_file and Driver::sqlite modules creating temporary files insecurely. It is possible for a user to use a symlink style attack to manipulate arbitrary files, resulting in a loss of integrity.
Currently, there are no known workarounds or upgrades to correct this issue. However, Julien Danjou has released a patch to address this vulnerability.