Joomla! Documentation™

A vulnerable extension is one that has been found to contain (or contribute to) a security vulnerability.

Vulnerable extensions are not necessarily poorly-coded. As the Web evolves, technical requirements and commonly accepted coding practices change. Active projects release new versions of their extensions as requirements change. For this reason, it is important to:

1. Know the version numbers of all installed extensions.
2. Use only the latest stable version of all extensions.
3. Completely remove all files of insecure or unused extensions.