flightbycanto Canto Plugin up to 3.1.1 on WordPress class-canto.php updateOptions authorization

Summaryinfo

A vulnerability was found in flightbycanto Canto Plugin up to 3.1.1 on WordPress. It has been rated as critical. Affected by this issue is the function updateOptions of the file class-canto.php. Performing a manipulation results in authorization. This vulnerability is cataloged as CVE-2026-6441. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as critical has been found in flightbycanto Canto Plugin up to 3.1.1 on WordPress. This affects the function updateOptions of the file class-canto.php. The manipulation with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as CWE-862. The product does not perform an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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).

The weakness was shared by Abhirup Konwar. The advisory is shared at wordfence.com. This vulnerability is uniquely identified as CVE-2026-6441 since 04/16/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/17/2026).

By approaching the search of inurl:class-canto.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• WordPress Plugin

Vendor

• flightbycanto

Name

• Canto Plugin

Version

• 3.1.0
• 3.1.1

CPE 2.3info

• 🔒
• 🔒

CPE 2.2info

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• 🔒

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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