Not a massive update but the Joomla team have released an update to version 1.5.15

It can be downloaded here.  If you need help with updating post a comment and we can write an article on it.

Description

When logged into the front end with Author access, it was possible to replace an article written by another user.

Affected Installs

All 1.5.x installs prior to and including 1.5.14 are affected.

Solution

Upgrade to latest Joomla! version (1.5.15 or newer).