CSRF exists in BigTree CMS through 4.2.18 with the force parameter to /admin/pages/revisions.php - for example: /admin/pages/revisions/1/?force=false. A page with id=1 can be unlocked.

Unrestricted File Upload exists in BigTree CMS through 4.2.18: if an attacker uploads an 'xxx.pht' or 'xxx.phtml' file, they could bypass a safety check and execute any code.

BigTree CMS through 4.2.17 relies on a substring check for CSRF protection, which allows remote attackers to bypass this check by placing the required admin/developer/ URI within a query string in an HTTP Referer header. This was found in core/admin/modules/developer/_header.php and patched in core/inc/bigtree/admin.php on 2017-04-14.

Unrestricted File Upload exists in BigTree CMS before 4.2.17: if an attacker uploads an 'xxx.php[space]' file, they could bypass a safety check and execute any code.

An issue was discovered in BigTree CMS before 4.2.15. The vulnerability exists due to insufficient filtration of user-supplied data in the "id" HTTP GET parameter passed to the "core/admin/adjax/dashboard/check-module-integrity.php" URL. An attacker could execute arbitrary HTML and script code in a browser in the context of the vulnerable website.