CVE-2026-29179: October CMS October

Low severity, CVSS 3.3. EPSS: 0.2% chance of exploitation in the next 30 days.

October is a Content Management System (CMS) and web platform. Prior to 3.7.16 and 4.1.16, fine-grained sub-permission checks for asset and blueprint file operations were not enforced in the CMS and Tailor editor extensions. This only affects backend users who were explicitly granted editor access but had editor.cms_assets or editor.tailor_blueprints specifically withheld, an uncommon permission configuration. In this edge case, such users could perform file operations (create, delete, rename, move, upload) on theme assets or blueprint files despite lacking the required sub-permission. A related operator precedence error in the Tailor navigation also disclosed the theme blueprint directory tree under the same conditions. This vulnerability is fixed in 3.7.16 and 4.1.16.

Affected products

• October CMS October: from 4.0.0, before 4.1.16 (fixed in 4.1.16); before 3.7.16 (fixed in 3.7.16)

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