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 Version
You may upgrade to XenForo 1.4.11 to fix this issue. You should upgrade as you would to any other release.
Customers with an active license may download this version from their customer area. Full details for how to install and upgrade XenForo can be found in the XenForo Manual.
Method 2: Install the Patch (for 1.4 Users)
Download the patch zip file attached to the end of this message. It contains 2 files:
Note that with this method there is no outward indication that the patch has been applied. We recommend upgrading if possible.
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