Multiple cross-site scripting (XSS) vulnerabilities in jforum.page in JForum 2.1.9 allow remote attackers to inject arbitrary web script or HTML via the (1) action, (2) match_type, (3) sort_by, or (4) start parameters.

Open redirect vulnerability in JForum 2.1.9 allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via a URL in the returnPath parameter in a validateLogin action to jforum.page.

Cross-site request forgery (CSRF) vulnerability in admBase/login.page in the Admin module in JForum allows remote attackers to hijack the authentication of administrators for requests that change the user group permissions of arbitrary users via a groupsSave action.

JForum v2.8.0 was discovered to contain a Cross-Site Request Forgery (CSRF) via http://target_host:port/jforum-2.8.0/jforum.page, which allows attackers to arbitrarily add admin accounts.

ViewCommon.java in JForum2 2.7.0 allows XSS via a user signature.

In JForum 2.1.8, an unauthenticated, remote attacker can enumerate whether a user exists by using the "create user" function. If a register/check/username?username= request corresponds to a username that exists, then an "is already in use" error is produced. NOTE: this product is discontinued.