TGCaptcha2 version 0.3.0 is vulnerable to a replay attack due to a missing nonce allowing attackers to use a single solved CAPTCHA multiple times.Referenceshttps://bugzilla.redhat.com/show_bug.cgi?id=1316083https://patrick.uiterwijk.org/2016/03/09/fedora-spam-dwf-2016-89000/
