SiberianCMS - CWE-434: Unrestricted Upload of File with Dangerous Type - A malicious user with administrative privileges may be able to upload a dangerous filetype via an unspecified method
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.