DotNetNuke 4.8.4 has been released which fixes 3 low security issues. These issues are related to cross-site attacks. Please check following bulletins to get more info about security fixes.
It's highly recommended to upgrade DotNetNuke to latest security release which is currently v4.8.4. If you don't know how to upgrade your portal, please read following blog post. How to Upgrade DotNetNuke to 4.8.4 Release
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