Flat PHP Board 1.2 and earlier stores sensitive information under the web root with insufficient access control, which allows remote attackers to obtain credentials via a direct request for the username php file for any user account in users/.

index.php in Flat PHP Board 1.2 and earlier allows remote authenticated users to obtain the password for the current user account by reading the password parameter value in the HTML source for the page generated by a profile action.

Flat PHP Board 1.2 and earlier allows remote attackers to bypass authentication and obtain limited access to an arbitrary user account via the fpb_username cookie.

Multiple directory traversal vulnerabilities in index.php in Flat PHP Board 1.2 and earlier allow remote attackers to (1) create arbitrary files via a .. (dot dot) in the username parameter when registering a user account, and (2) read arbitrary PHP

Direct static code injection vulnerability in index.php in Flat PHP Board 1.2 and earlier allows remote attackers to inject arbitrary PHP code via the (1) username, (2) password, and (3) email parameters when registering a user account, which can be