CVE-2026-6441 Canto <= 3.1.1 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Setting Modification
Authenticated subscribers can arbitrarily modify or delete Canto plugin settings and cron schedules due to missing authorization checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-6441?
CVE-2026-6441 is a medium-severity missing authorization vulnerability in flightbycanto Canto, published on 17 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Canto plugin for WordPress is vulnerable to Missing Authorization in versions up to and including 3.1.1. This is due to the absence of any capability check or nonce verification in the updateOptions() function, which is exposed via two AJAX hooks: wp_ajax_updateOptions (class-canto.php line 231) and wp_ajax_fbc_updateOptions (class-canto-settings.php line 76). Both hooks are registered exclusively under the wp_ajax_ prefix (requiring only a logged-in user), with no call to current_user_can() or check_ajax_referer(). This makes it possible for authenticated attackers with subscriber-level access and above to arbitrarily modify or delete plugin options controlling cron scheduling behavior (fbc_duplicates, fbc_cron, fbc_schedule, fbc_cron_time_day, fbc_cron_time_hour, fbc_cron_start) and to manipulate or clear the plugin's scheduled WordPress cron event (fbc_scheduled_update).
Weakness: CWE-862
Which versions are affected by CVE-2026-6441?
How do I fix CVE-2026-6441?
No fix has been published for CVE-2026-6441 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-6441 being exploited?
There is no known exploitation of CVE-2026-6441 in the wild and no public exploit code.
Sources
Also known as GHSA-8pj7-rr49-2c47.