Reported vulnerability

Canto <= 3.1.1 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Setting Modification

Q: Which versions of Canto are affected?

Wordfence lists these affected versions: Start version unspecified, through 3.1.1. Use the version checker above to compare your installed release with this report.

Q: Is a fix available for Canto?

Wordfence reports a fix for this issue in Canto. It lists these fixed versions: 3.1.2. Back up your website and test the recommended update before applying it to your live site.

Q: Where can I find my installed plugin version?

In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.

Published 16 Apr 2026

Updated 8 Jul 2026

CVE-2026-6441

Compare your installed software with the affected versions below. Follow the source’s remediation guidance and test an available update after taking a backup. A database entry describes a reported issue; it does not establish whether a particular website has been compromised.

Does this affect my version?

Check your installed version against this advisory. This compares the report’s version ranges and does not scan your website.

Wordfence advisory

medium · CVSS 4.3

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).

Severity vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Canto

Software: plugin · canto
Affected versions: Start version unspecified, through 3.1.1
Fix availability: Fix available
Fixed versions: 3.1.2

Recommended action

Update to version 3.1.2, or a newer patched version

Further references (1)

wordfence.com/threat-intel/vulnerabilities/id/c1a0200f-9861-4eca-adbf-d458eb6b4e63?source=api-prod

Data sources and licences

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CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.

Read licence terms

Source: Wordfence

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Questions about this vulnerability

Which versions of Canto are affected?

Wordfence lists these affected versions: Start version unspecified, through 3.1.1. Use the version checker above to compare your installed release with this report.

Is a fix available for Canto?

Wordfence reports a fix for this issue in Canto. It lists these fixed versions: 3.1.2. Back up your website and test the recommended update before applying it to your live site.

Where can I find my installed plugin version?

In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.

Does an affected version mean my website has been hacked?

An affected version means the installed release matches a vulnerability described in this report. It does not show whether anyone has exploited it on your website. The checker compares version numbers with stored reports; it does not inspect your website.

These reports cover at least one of the same plugins, themes or WordPress core. Check each report’s affected versions separately.

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