SecurityCenter is potentially impacted by several vulnerabilities in PHP that were recently disclosed and fixed. Note that due to the time involved in doing a full analysis of each issue, Tenable has opted to patch the included version of PHP as a precaution, and to save time.
Version 5.0.1 will be released as a fix for the current 5.0.0.1 release, which is currently scheduled for a July, 2015 release. Users of 4.6.x, 4.7.x, and 4.8.0 must upgrade to 4.8.1 or later to resolve this issue.