Describe CVE-2017-6906.
What is CVE-2017-6906?
An issue was discovered in SiberianCMS before 4.10.0.  The vulnerability exists due to insufficient filtration of user-supplied data (log) passed to the "SiberianCMS-master/errors/500.php" URL.  An attacker could execute arbitrary HTML and script code in a browser in the context of the vulnerable website..