Canto <= 3.1.1 - Missing Authorization to Unauthenticated File Upload
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| WordPress plugin | Canto | <= 3.1.1 | 3.1.2 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N- Weakness (CWE)
CWE-862- Platform
- WordPress
- Package
Canto- Disclosed
- 20.03.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
Wordfence Intelligence - 0777f759-6980-4572-a866-0210bd5f5085 - Wordfence Intelligence
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Copyright 2012-2026 Defiant Inc.
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Vulnerability history: Canto
All published vulnerabilities of this package (WordPress plugin), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 9
- First → latest
- 03.2020 04.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 3
- High 4
- Medium 2
Disclosures per year
- 2020: 4
- 2021: 0
- 2022: 0
- 2023: 1
- 2024: 2
- 2025: 0
- 2026: 2
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