Joomla! com_mailto 1.5.x through 1.5.13 has an automated mail timeout bypass.
https://www.openwall.com/lists/oss-security/2011/12/25/9
https://euvd.enisa.europa.eu/vulnerability/EUVD-2011-4823
https://developer.joomla.org/security/news/303-20090723-core-com-mailto-timeout-issue.html