We have recently become aware of a security issue within XenForo and have released a patch and new version (XenForo 1.3.9) to resolve this issue. We strongly recommend all XenForo customers follow the steps below to resolve this issue.The issue was discovered by Miguel Ángel Jimeno (@migueljimeno96). It employs a tactic known as "reverse tabnabbing" in which a link that opens in a new tab contains code that can redirect the original tab to another URL, which could be used as a phishing attempt.If you have any questions relating to installing this patch or upgrading to the new version, please post in the Upgrade Support forum.Method 1: Upgrade to the New VersionYou may upgrade to XenForo 1.3.9 to fix this issue. You should...