The latest critical patch for Magento
SUPEE-5994 – This patch addresses multiple security vulnerabilities in Magento Community Edition software, including issues that can put customer information at risk. – Added May 14, 2015
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The patch available for download using the link above is a .sh patch and requires that you be able to run the SSH command. For patch files with the file extension .sh:
Some hosting provider do not provide SSH on shared accounts. Running an SSH command may confuse others. Not to worry. You can simply FTP the patched files into your Magento ROOT directory.
Patch SUPEE-5994 (Magento 1.6.x.x-18.104.22.168) applied to the following files:
Step One: Make sure your Magento Compiler is disabled. Go to System > Tools > Compilation
Step 2: Download zip below with the patched files, unzip them, FTP and drag all directories and get.php to overwrite the same files in your Magento ROOT directory with the new unzipped folders/files.
Step 3: Mark as read or delete the critical notice in notifications.
That is all there is too it.