WebSTAR contains a flaw that may allow a malicious user to gain access to unauthorized privileges. The issue is due to WebSTAR overwriting other files via symlink. By overwriting the files related to the cron subsystem, a local attacker can obtain administrative privileges, resulting in a loss of integrity.
Upgrade to version 5.3.3 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.