Grav Flex Objects plugin vulnerabilities

Grav Flex Objects plugin 1.4.0 before 1.4.17 contains an authorization bypass because its generic /api/v1/flex-objects/pages API routes check only directory-level admin.pages permissions without enforcing api.pages.read/write or page-level permission rules. Authenticated non-super users can read page source and frontmatter, modify content, or delete pages they are denied.

The Grav Flex Objects plugin prior to 1.4.3 has requireFlexPermission() that returns without denying access when a directory blueprint omits config.admin.permissions. An authenticated account with only api.access can use index, show, create, update, delete, export, and media handlers for a permission-less directory even though the core admin.flex-object authorization fallback would deny the same actions.

The Grav Flex Objects plugin before version 1.4.0 contains a stored server-side template injection vulnerability. When rendering dynamic collection or object titles, user-controlled frontmatter values are passed to Twig's template_from_string(), causing them to be evaluated as Twig code rather than text. This bypasses Grav's Security::cleanDangerousTwig() sanitization.