Authorization Checks Bypass in TDuck Survey Form by TDuckCloud
CVE-2026-100303

5.3MEDIUM

Key Information:

Vendor

Tduckcloud

Status
Tduck-survey-form
Vendor
CVE Published:
25 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-100303?

The TDuck Survey Form, up to version 6.0, is susceptible to an authorization bypass vulnerability. Non-admin authenticated users can exploit the FormThemeController endpoints to manipulate global form themes and categories. This allows them to add, modify, or delete themes and theme categories, which can adversely affect forms owned by other users. Proper authorization checks are absent, potentially leading to unauthorized access and configuration changes within the application.

Affected Version(s)

tduck-survey-form 0 <= 6.0

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-2026-100303 - Proof of Concept

References

https://github.com/LinYuanyi1/cve-request-poc/blob/adffc3...
exploit
https://github.com/TDuckCloud/tduck-survey-form
product
https://github.com/TDuckCloud/tduck-survey-form/blob/43ff...
technical-description

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
Low
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

Yaqi Chao
Mingsheng Lin
.