WHMCS has released new updates for all supported versions of WHMCS. These updates include changes that address security concerns within the WHMCS product.
WHMCS has rated these updates as having a Trivial to Important security impact. Information on security ratings can be found at http://docs.whmcs.com/Security_Levels
ReleasesPlease update your installation to the latest version 5.3.14.
Patches - What is a Patch?
Incremental patches can be downloaded by following the links below.
These patch sets...
Read more @ http://blog.whmcs.com/?t=101475