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CVE-2026-3335— Canto <= 3.1.1 - Missing Authorization to Unauthenticated File Upload

Quick assessment

Affected
flightbycanto Canto
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin Canto 3.1.1及之前版本存在安全漏洞，该漏洞源于缺少身份验证、授权和随机数检查，可能导致未经授权的文件上传。

CVSS 5.3 · Medium EPSS 1.14% · P64

Public Exploits 1

Nuclei · 1 CVE-2026-3335.yaml [template]
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I. Basic Information for CVE-2026-3335

Vulnerability Information
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Vulnerability Title
Canto <= 3.1.1 - Missing Authorization to Unauthenticated File Upload
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress plugin Canto 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin Canto 3.1.1及之前版本存在安全漏洞，该漏洞源于缺少身份验证、授权和随机数检查，可能导致未经授权的文件上传。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
flightbycanto Canto * ~ 3.1.1 -

II. Public POCs for CVE-2026-3335

# POC Description Source Link Shenlong Link
1 The Canto plugin for WordPress is vulnerable to missing authorization in the copy-media.php upload flow. The file is directly accessible and accepts attacker-controlled parameters for the upload destination, allowing unauthenticated users to upload arbitrary files constrained to WordPress-allowed MIME types. The fbc_app_api parameter controls the domain WordPress fetches from via wp_safe_remote_get, enabling SSRF to attacker-controlled infrastructure. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-3335.yaml POC Details
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III. Intelligence Information for CVE-2026-3335

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Patches & Fixes for CVE-2026-3335 (6)

Vendor Advisories for CVE-2026-3335 (1)

IV. Related Vulnerabilities

Same product: Canto
Same vendor: flightbycanto
Same weakness: CWE-862

V. Comments for CVE-2026-3335

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