Joomla! -- multiple vulnerabilities

The JSST and the Joomla! Security Center report:

[20161001] - Core - Account Creation

Inadequate checks allows for users to register on a site when registration has been disabled.

[source]

[20161002] - Core - Elevated Privilege

Incorrect use of unfiltered data allows for users to register on a site with elevated privileges.

[source]

[20161003] - Core - Account Modifications

Incorrect use of unfiltered data allows for existing user accounts to be modified; to include resetting their username, password, and user group assignments.

[source]