CVE-2017-7881: Bigtreecms Bigtree CMS

High severity, CVSS 8.8. EPSS: 0.8% chance of exploitation in the next 30 days.

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.

Affected products

• Bigtreecms Bigtree CMS: up to and including 4.2.17

Published 2017-04-15. Last modified 2026-06-17.