An unauthenticated privilege-escalation issue exists in the bbPress plugin before 2.6.5 for WordPress when New User Registration is enabled.

The Inline Image Upload for BBPress plugin for WordPress is vulnerable to arbitrary file uploads due to missing file extension validation in the file uploading functionality in all versions up to, and including, 1.1.19. This makes it possible for authenticated attackers, with Subscriber-level access and above, to upload arbitrary files on the affected site's server which may make remote code execution possible. This may be exploitable by unauthenticated attackers when the "Allow guest users without accounts to create topics and replies" setting is enabled.

SQL injection vulnerability in bb-includes/formatting-functions.php in bbPress before 0.8.1 might allow remote attackers to execute arbitrary SQL commands via unspecified vectors to forums/bb-edit.php, as demonstrated by a PRE element, aka the "quircky slashes bug."

The bbPress plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.6.11. This is due to missing or incorrect nonce validation on the bbpuseraddroleonregister() function. This makes it possible for unauthenticated attackers to elevate their privileges to that of a bbPress Keymaster via a forged request granted they can trick a site administrator into performing an action such as clicking on a link. Rather than implementing a nonce check to provide protection against this vulnerability, which would break functionality, the plugin no longer makes it possible to select a role during registration.

bbPress through 1.0.2 has XSS in /bb-login.php url via the re parameter.

bbPress 1.0.2 allows remote attackers to obtain sensitive information via a direct request to a .php file, which reveals the installation path in an error message, as demonstrated by bb-templates/kakumei/view.php and certain other files.

The bbPress plugin through 2.6.4 for WordPress has stored XSS in the Forum creation section, resulting in JavaScript execution at wp-admin/edit.php?posttype=forum (aka the Forum listing page) for all users. An administrator can exploit this at the wp-admin/post.php?action=edit URI.

Cross-site scripting (XSS) vulnerability in bb-login.php in bbPress 0.8.1 allows remote attackers to inject arbitrary web script or HTML via the re parameter. NOTE: exploitation may require forcing the client to send a certain Referer header.