An issue was discovered in Simple Machines Forum (SMF) before release 2.0.17. There is SSRF related to Subs-Package.php and Subs.php because user-supplied data is used directly in curl calls.
The password reset functionality in Simple Machines Forum (SMF) 1.0.x before 1.0.14, 1.1.x before 1.1.6, and 2.0 before 2.0 beta 4 includes clues about the random number generator state within a hidden form field and generates predictable validation codes, which allows remote attackers to modify passwords of other users and gain privileges.
Simple Machine Forum (SMF) versions 1.0.4 and earlier have an SQL injection vulnerability that allows remote attackers to inject arbitrary SQL statements.
Simple Machines Forum (SMF) before 1.1.19 and 2.x before 2.0.6 allows remote attackers to impersonate arbitrary users via multiple space characters characters.
Packages.php in Simple Machines Forum (SMF) 2.1 allows remote attackers to conduct PHP object injection attacks and execute arbitrary PHP code via the themechanges array parameter.
Multiple SQL injection vulnerabilities in Simple Machines Forum (SMF) before 1.1.15 and 2.x before 2.0.1 allow remote attackers to execute arbitrary SQL commands via vectors involving a (1) HTML entity or (2) display name. NOTE: some of these details are obtained from third party information.
The loadUserSettings function in Load.php in Simple Machines Forum (SMF) before 1.1.13, and 2.x before 2.0 RC5, does not properly handle invalid login attempts, which might make it easier for remote attackers to obtain access or cause a denial of service via a brute-force attack.
Simple Machines Forum (SMF) before 1.1.13, and 2.x before 2.0 RC5, does not properly validate the start parameter, which might allow remote attackers to conduct SQL injection attacks, obtain sensitive information, or cause a denial of service via a crafted value, related to the cleanRequest function in QueryString.php and the constructPageIndex function in Subs.php.
Simple Machines Forum (SMF) 2.0.6, 1.1.19, and earlier allows remote attackers to impersonate arbitrary users via a Unicode homoglyph character in a username.