---
id: CVE-2026-51876
title: >-
  DeepTutor 1.4.0 contains an authorization bypass vulnerability in the book
  confirmation flow
summary: >-
  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, causi…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-285
published: '2026-10-01'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T01:16:35.727'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-51876'
references:
  - url: 'https://gist.github.com/Ro1ME/c5685936179edcbf942f3fdd745d1473'
    label: cve@mitre.org
  - url: 'https://github.com/HKUDS/DeepTutor/issues/514'
    label: cve@mitre.org
  - url: 'https://github.com/HKUDS/DeepTutor/issues/514'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-05T23:51:10.775228Z'
epss: 0.00324
epssPercentile: 0.2525
ingestedAt: '2026-10-01T23:03:32.773Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.