CVE-2026-51876Critical· 9.1▾ AbyssalPoC available

DeepTutor 1.4.0 contains an authorization bypass vulnerability in the book confirmation flow

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…

▾ Abyssal zone — Critical with a public exploit or in-the-wild use

Depth score62/ 100 · Elevated

impact 50.1 · likelihood 0.1 · exploitation 12

⚡ Agent-ready:Raw markdown ↗JSON ↗

Proof of concept

A public proof-of-concept already exists for this vulnerability — see Exploit availability below.

…

Published

Oct 1, 2026

Updated

Oct 6, 2026

CVSS

9.1

Vendor

—

Product

—

CWE

CWE-285

Depth score

62 · Elevated

EPSS

0.32% · p25

Platforms

—

Source

NVD

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CISA SSVC

decided 2026-10-05

Exploitation: poc
Automatable: yes
Technical impact: total

Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.

EPSS history

Exploit-prediction probability, daily snapshots since Oct 2.

0.2% → 0.3%▲ 0.2%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

7 events · 25 days

Oct 1, 2026Published
Disclosed via NVD
Oct 2, 2026EPSS first tracked
0.2%
Oct 6, 2026Record revised
Last analysed / modified upstream
Oct 6, 2026Public exploit observed
Exploit / PoC code exists
Oct 6, 2026CVSS changed
— → 9.1
Oct 6, 2026Severity changed
none → critical
Oct 26, 2026EPSS peak
0.2% → 0.3%

CWE-285 #nvd #cve.org #exploit-available

Full technical detail▾

Overview

Remediation

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

References

Change history

Field changes observed since this record was first indexed.

Oct 6, 2026Public exploit / PoC published
Oct 6, 2026CVSS — → 9.1
Oct 6, 2026Severity none → critical

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd#cve.org#exploit-available

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