CVE-2026-51876

Critical severity, CVSS 9.1. EPSS: 0.3% chance of exploitation in the next 30 days.

DeepTutor 1.4.0 contains an authorization bypass vulnerability in the book confirmation flow. An unauthenticated or unauthorized caller can reuse a publicly exposed book_id to submit a confirm-proposal request for an existing book, causing unauthorized overwrites of persisted metadata and spine content.

Published 2026-10-01. Last modified 2026-10-06.