Recently, important updates were released for Joomla 2.5 and Joomla 3.1 that address a critical security issue where unauthorized file uploads may be uploaded to a site.
Joomla 1.5 is affected by a security vulnerability "unauthorized file uploads". Joomla 1.5 has reached it's end-of-life and no update is being released for it.
To apply the security patch:
- If the site is currently at Joomla 1.5.26 proceed to step 2. If not upgrade your site to the latest stable version of Joomla 1.5 using this update package.
- Download the Security Patch attached to this article
- Log into your Joomla 1.5 administration panel
- Select Extensions > Install/Uninstall > Choose File > Upload & Install
The installer cleans up after itself, leaving only the files that the patch replaces.