You can apply the patches are available at https://confluence.atlassian.com/display/JIRA/JIRA+Security+Advisory+2013-02-21
For example, if you are running JIRA 5.1.1 , you will need to upgrade to JIRA 5.1.4 in order to apply the patch.
My recommendation, upgrade to the latest JIRA 5.2.7 since it is already fix in this later version.
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