Is Confluence version 4.2.13 is in any way vulnerable to apache struts-related attacks (including, but not limited to CVE-2017-5638)?
https://confluence.atlassian.com/doc/confluence-4-2-13-release-notes-298978950.html shows that 4.2.13 was released on August 12th 2012
https://confluence.atlassian.com/display/DOC/Confluence+Security+Overview+and+Advisories?src=contextnavpagetreemode has the list of all security advisories. I would read all the ones from 2011 forward.
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