Do not rely on all security issues being patched or reported for EOL(end of life) versions.
This page is for Joomla! versions which have reached EOL(end of life) and are no longer being developed or supported by the Joomla! project. Issues and items are only listed on this page as a benefit to the users of EOL versions who have not migrated to a supported version yet.
It is strongly recommended you update your websites to a supported Joomla! version ASAP.
Although Joomla 1.5 has reached EOL(end of life), if there is a critical security issue with a fix it may be reported here.
There is a security issue in all versions of Joomla related to unauthorized file uploads.