The hook_process function in the plugin API for WeeChat 0.3.0 through 0.3.9.1 allows remote attackers to execute arbitrary commands via shell metacharacters in a command from a plugin, related to "shell expansion."
https://wiki.mageia.org/en/Support/Advisories/MGASA-2012-0347
https://savannah.nongnu.org/bugs/?37764
http://www.securityfocus.com/bid/56584
http://www.openwall.com/lists/oss-security/2012/11/19/4
http://www.mandriva.com/security/advisories?name=MDVSA-2013:136
http://secunia.com/advisories/51377
http://secunia.com/advisories/51294
http://lists.opensuse.org/opensuse-updates/2012-11/msg00087.html
http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00018.html
http://lists.fedoraproject.org/pipermail/package-announce/2012-November/093516.html
http://lists.fedoraproject.org/pipermail/package-announce/2012-November/093495.html
http://lists.fedoraproject.org/pipermail/package-announce/2012-November/093260.html