Write Password Bypass in TDuck Survey Form by TDuck Cloud
CVE-2026-100306

6.9MEDIUM

Key Information:

Vendor

Tduckcloud

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

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-100306?

The TDuck Survey Form version 6.0 has a vulnerability that allows remote unauthenticated attackers to submit form entries without providing valid passwords. The application relies solely on client-side validation for write password enforcement, which can be bypassed through direct API access using the form key from shared links. This poses a significant risk as it undermines the integrity of submitted data and exposes sensitive submission APIs to unauthorized exploitation.

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-2026-100306 - 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:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
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

Yaqi Chao
Mingsheng Lin
.