WordPress · Canto · CVE-2026-6441
**Name of the Vulnerable Software and Affected Versions**
Canto plugin for WordPress versions prior to 3.1.2
**Description**
Missing authorization occurs due to the absence of capability checks or nonce verification in the `updateOptions()` function. This function is exposed via two AJAX hooks: 'wp ajax updateOptions' and 'wp ajax fbc updateOptions'. Because these hooks are registered under the `wp ajax ` prefix without calls to `current user can()` or `check ajax referer()`, authenticated attackers with subscriber-level access or higher can arbitrarily modify or delete plugin options that control cron scheduling behavior, specifically `fbc duplicates`, `fbc cron`, `fbc schedule`, `fbc cron time day`, `fbc cron time hour`, and `fbc cron start`. Additionally, attackers can manipulate or clear the scheduled WordPress cron event `fbc scheduled update`.
**Recommendations**
Update to a version later than 3.1.1.
As a temporary workaround, restrict access to the `updateOptions()` function or the associated AJAX hooks until a patch is applied.