Transifex command-line client before 0.9 does not validate X.509 certificates, which allows man-in-the-middle attackers to spoof a Transifex server via an arbitrary certificate.
https://bugzilla.redhat.com/show_bug.cgi?id=952194
http://www.openwall.com/lists/oss-security/2013/05/22/14
http://blog.transifex.com/post/51072109836/new-version-of-the-transifex-client-has-been-released