IE10 is known to have problems with older versions of the applications, so I'd advise you to either use another browser or, if you have upgraded this for all users that access the apps, to upgrade JIRA and Confluence.
IE 10 is supported for JIRA since 6.0, and for Confluence since 5.1.
Two vulnerabilities have been published for Confluence Server and Data Center recently: March 20, 2019 CVE-2019-3395 / CVE-2019-3396 April 17, 2019 CVE-2019-3398 The goal of this article is...
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