Directory traversal vulnerability in Advanced Guestbook 2.4.2 allows remote attackers to bypass .htaccess settings, and execute arbitrary PHP local files or read arbitrary local templates, via a .. (dot dot) in a lang cookie, followed by a filename without its .php extension, as demonstrated via a request to index.php.

Advanced Guestbook 2.4.2 allows remote attackers to obtain sensitive information via an invalid (1) GB_TBL parameter to (a) lang/codes-english.php or (b) image.php, which reveal the database name; (2) an invalid GB_DB parameter to index.php, coupled with a ../index lang cookie, which reveals the installation path; or (3) a direct request to index.php with no parameters or cookies, which reveals the installation path.

Cross-site scripting (XSS) vulnerability in picture.php in Advanced Guestbook 2.4.2 allows remote attackers to inject arbitrary web script or HTML via the picture parameter.

Multiple PHP remote file inclusion vulnerabilities in Advanced Guestbook 2.4.2 allow remote attackers to execute arbitrary PHP code via a URL in the include_path parameter to (1) index.php, (2) addentry.php, or (3) picture.php, a different set of vectors than CVE-2006-5804. NOTE: this issue has been disputed by third party researchers, stating that the include_path variable is instantiated before use