engine/lib/users.php in Elgg before 1.8.5 does not properly specify permissions for the useradd action, which allows remote attackers to create arbitrary accounts.

Cross-site scripting (XSS) vulnerability in engine/lib/views.php in Elgg before 1.8.5 allows remote attackers to inject arbitrary web script or HTML via the view parameter to index.php. NOTE: some of these details are obtained from third party information.

engine/lib/access.php in Elgg before 1.8.5 does not properly clear cached access lists during plugin boot, which allows remote attackers to read private entities via unspecified vectors.