CVE-2026-104059: Lektor

High severity, CVSS 8.1. EPSS: 0.1% chance of exploitation in the next 30 days.

Lektor 3.3.14 and 3.4.0b15 contains a cross-site request forgery vulnerability in the admin API blueprint that allows unauthenticated attackers to perform state-changing actions by sending cross-origin requests without CSRF tokens, Origin/Referer validation, CORS configuration, or Host allowlisting. Attackers can exploit the newattachment, deleterecord, build, clean, and publish endpoints from a malicious web page to write arbitrary files, delete pages, wipe build output, trigger deployment publication, and via DNS rebinding reach read endpoints to disclose data.

Affected products

• Lektor Lektor: up to and including 3.3.14; from 3.4.0b1, up to and including 3.4.0b15

Published 2026-10-01. Last modified 2026-10-02.