Targeted Security Releases have been published for our Current and Long Term Support versions (8.7 and 8.6)
Owned License holders will be able to auto-update to 8.7.3 or 8.6.2, if your Support & Updates was active during those releases.
We have also exceeded our Long Term Support policy by providing a patch for 8.5, because it recently reached End of Life. Users can apply if your Support & Updates was active during the 8.5 release.
We do not recommend running an End of Life version of WHMCS for this reason.
However on this occasion, if you're running an older End of Life version, please contact support and we can assist: https://www.whmcs.com/submit-a-ticket/