Authorization Bypass in Book Chapter Read Handler of XXYOpen Novel System
CVE-2026-123677

5.3MEDIUM

Key Information:

Vendor

Xxyopen

Status
Novel
Vendor
CVE Published:
6 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-123677?

A manipulation of the chapterId argument within the getBookChapter function of the Book Chapter Read Handler in the XXYOpen novel software up to version 3.5.0 presents a serious authorization bypass vulnerability. This flaw allows remote attackers to gain unauthorized access to content. The vulnerability has been publicly disclosed and highlighted for urgent attention. Users are advised to apply the provided patch (b8134e774820e0971fa9d8074405b49a01c99bdc) to mitigate the risk.

Affected Version(s)

novel 3.0

novel 3.1

novel 3.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-123677 - Proof of Concept

References

https://vuldb.com/vuln/431794
vdb-entrytechnical-description
https://vuldb.com/vuln/431794/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-123677
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

carfeii (VulDB User)
.