source: https://www.securityfocus.com/bid/28866/info

SMF (Simple Machine Forum) is prone to a security-bypass vulnerability that occurs in the audio CAPTCHA protocol.

Successfully exploiting this issue may allow attackers to send unsolicited spam or perform other automated attacks.

https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/31678.zip