Simple Machines Forum (SMF), probably 1.1.4, relies on "randomly generated static" to hinder brute-force attacks on the WAV file (aka audio) CAPTCHA, which allows remote attackers to pass the CAPTCHA test via an automated attack that considers Hamming distances. NOTE: this issue reportedly exists because of an insufficient fix for CVE-2007-3308.

Cross-site scripting (XSS) vulnerability in sboxDB.php in Simple Machines Forum (SMF) Shoutbox 1.14 through 1.16b allows remote attackers to inject arbitrary web script or HTML via strings to the shoutbox form that start with "&#", contain the desired script, and end with ";".

Cross-site scripting (XSS) vulnerability in Simple Machines Forum (SMF) 1.1.4 and earlier allows remote attackers to inject arbitrary web script or HTML via (1) Itemid or (2) topic arguments.

Simple Machines Forum (SMF) 1.1.4 allows remote attackers to read a message in private forums by using the advanced search module with the "show results as messages" option, then searching for possible keywords contained in that message.

SQL injection vulnerability in Sources/Search.php in Simple Machines Forum (SMF) 1.1.3, when MySQL 5 is used, allows remote attackers to execute arbitrary SQL commands via the userspec parameter in a search2 action to index.php.

Directory traversal vulnerability in index.php in Simple Machines Forum (SMF) 1.1.3 allows remote attackers to include local files via unspecified vectors related to the sourcedir parameter or the actionArray hash. NOTE: CVE and multiple third parties dispute this vulnerability because both sourcedir and actionArray are defined before use

Simple Machines Forum (SMF) 1.1.2 uses a concatenation method with insufficient randomization when creating a WAV file CAPTCHA, which allows remote attackers to pass the CAPTCHA test via an automated brute-force attack.

Unspecified vulnerability in Simple Machines Forum (SMF) 1.1.2 allows remote attackers to execute arbitrary PHP code during (1) creation or (2) editing of a message.

Session fixation vulnerability in Simple Machines Forum (SMF) 1.1.2 and earlier allows remote attackers to hijack web sessions by setting the PHPSESSID parameter.

QueryString.php in Simple Machines Forum (SMF) 1.0.7 and earlier, and 1.1rc2 and earlier, allows remote attackers to more easily spoof the IP address and evade banning via a modified X-Forwarded-For HTTP header, which is preferred instead of other more reliable sources for the IP address. NOTE: the original researcher claims that the vendor has disputed this issue