CAPTCHA bypass vulnerability in MantisBT before 1.2.19.
https://www.mantisbt.org/bugs/view.php?id=17984
https://www.mantisbt.org/bugs/changelog_page.php?project=mantisbt&version=1.2.19
https://exchange.xforce.ibmcloud.com/vulnerabilities/100213
https://bugzilla.redhat.com/show_bug.cgi?id=1183593