CVE-2026-26067: October CMS October

Medium severity, CVSS 4.9. EPSS: 0.4% chance of exploitation in the next 30 days.

October is a Content Management System (CMS) and web platform. Prior to 3.7.14 and 4.1.10, a server-side information disclosure vulnerability was identified in the handling of CSS preprocessor files. Backend users with Editor permissions could craft .less, .sass, or .scss files that leverage the compiler's import functionality to read arbitrary files from the server. This worked even with cms.safe_mode enabled. This vulnerability is fixed in 3.7.14 and 4.1.10.

Affected products

• October CMS October: from 4.0.0, before 4.1.10 (fixed in 4.1.10); before 3.7.14 (fixed in 3.7.14)

Published 2026-04-21. Last modified 2026-06-17.