CVE-2026-33355.3MediumCWE-862

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

flightbycanto · Canto

Affected: flightbycanto Canto · Exploitation: check available, not yet exploited

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

1.2%probability of exploitation in the next 30 days

67th percentile

050100

Higher than 67% of scored CVEs

5.3MediumCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

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 products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

flightbycanto · Cantoup to and including 3.1.1

On the Atlas

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Exploitation: Check available, not yet exploited. A public nuclei template can confirm it on a system you are authorised to test.
CISA KEV: Not listed
Public check: Canto <= 3.1.1 - Missing Authorization to Unauthenticated File Upload · nuclei template in projectdiscovery/nuclei-templates
Weakness: Missing Authorization · Access Control
Published: March 2026
Band: Check available, not yet exploited, March 2026

CoverageNo articles yet

No CyberSIXT article names CVE-2026-3335 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.