Authorization Bypass in Novel-plus Product by Lin Yuanyi
CVE-2026-90941

5.3MEDIUM

Key Information:

Vendor

201206030

Status
Novel-plus
Vendor
CVE Published:
14 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-90941?

The novel-plus product prior to version 5.3.3 is susceptible to an authorization bypass vulnerability within the BookController download endpoint. This security flaw allows authenticated backend users to export full book text, including chapters that are normally restricted to paying customers. By manipulating parameters such as bookId and bookName, attackers can bypass established permission checks and data access limitations, effectively gaining unauthorized access to content meant for paying users.

Affected Version(s)

novel-plus 0 <= 5.3.3

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-2026-90941 - Proof of Concept

References

https://github.com/LinYuanyi1/cve-request-poc/blob/master...
exploit
https://github.com/201206030/novel-plus/blob/d63c3ee39465...
technical-description
https://github.com/201206030/novel-plus/blob/d63c3ee39465...
technical-description

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

Mingsheng Lin
.