flightbycanto Canto Plugin up to 3.1.1 on WordPress URL copy-media.php fbc_flight_domain/fbc_app_api authorization

Summaryinfo

A vulnerability, which was classified as critical, was found in flightbycanto Canto Plugin up to 3.1.1 on WordPress. This affects an unknown function in the library /wp-content/plugins/canto/includes/lib/copy-media.php of the component URL Component. Executing a manipulation of the argument fbc_flight_domain/fbc_app_api can lead to authorization. This vulnerability appears as CVE-2026-3335. The attack may be performed from remote. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in flightbycanto Canto Plugin up to 3.1.1 on WordPress and classified as critical. This vulnerability affects some unknown functionality in the library /wp-content/plugins/canto/includes/lib/copy-media.php of the component URL Component. The manipulation of the argument fbc_flight_domain/fbc_app_api with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-862. The product does not perform an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The Canto plugin for WordPress is vulnerable to Missing Authorization in all versions up to, and including, 3.1.1 via the `/wp-content/plugins/canto/includes/lib/copy-media.php` file. This is due to the file being directly accessible without any authentication, authorization, or nonce checks, and the `fbc_flight_domain` and `fbc_app_api` URL components being accepted as user-supplied POST parameters rather than read from admin-configured options. Since the attacker controls both the destination server and the `fbc_app_token` value, the entire fetch-and-upload chain is attacker-controlled — the server never contacts Canto's legitimate API, and the uploaded file originates entirely from the attacker's infrastructure. This makes it possible for unauthenticated attackers to upload arbitrary files (constrained to WordPress-allowed MIME types) to the WordPress uploads directory. Additional endpoints (`detail.php`, `download.php`, `get.php`, `tree.php`) are also directly accessible without authentication and make requests using a user-supplied `app_api` parameter combined with an admin-configured subdomain.

The weakness was presented by heygork. The advisory is shared for download at wordfence.com. This vulnerability was named CVE-2026-3335 since 02/27/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

By approaching the search of inurl:wp-content/plugins/canto/includes/lib/copy-media.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 3.1.1 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

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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Once again VulDB remains the best source for vulnerability data.

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