CVE-2017-16941: October CMS October

High severity, CVSS 8.8. EPSS: 1.6% chance of exploitation in the next 30 days.

October CMS through 1.0.428 does not prevent use of .htaccess in themes, which allows remote authenticated users to execute arbitrary PHP code by downloading a theme ZIP archive from /backend/cms/themes, and then uploading and importing a modified archive with two new files: a .php file and a .htaccess file. NOTE: the vendor says "I don't think [an attacker able to login to the system under an account that has access to manage/upload themes] is a threat model that we need to be considering.

Affected products

• October CMS October: up to and including 1.0.428

Published 2017-11-25. Last modified 2026-06-17.