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EUVD-2026-292222

fkie_cve-2026-29179

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.

GHSA-jvwg-phxx-j3rp — October CMS: Editor Sub-Permission Bypass for Asset and Blueprint File Operations

Affected: Packagist: october/system

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.

### Impact - Only exploitable by authenticated backend users with `editor` access who have been specifically denied the `editor.cms_assets` or `editor.tailor_blueprints` sub-permissions - Does not affect default permission configurations where editor users typically have all sub-permissions granted - Users without `editor.cms_assets` could manipulate theme asset files (delete, rename, move, upload, create directories) - Users without `editor.tailor_blueprints` could manipulate blueprint files (delete, rename, move, upload, create directories) - Users without `editor.tailor_blueprints` could view the theme blueprint navigation tree, disclosing file paths and directory structure

### Patches The vulnerability has been patched in v3.7.16 and v4.1.16. Fine-grained document type permission checks are now enforced on all asset and blueprint file…