A vulnerability has been identified in KISGB, which could be exploited by attackers to execute arbitrary commands. This flaw is due to an input validation error in the "authenticate.php" script that does not validate the "default_path_for_themes" parameter, which could be exploited by remote attackers to include malicious PHP scripts and execute arbitrary commands with the privileges of the web server.
Vulnerable Products
Vulnerable Software: KISGB (Keep It Simple Guest Book) version 5.1.1 and prior
