Broken Access Control in TDuck Survey Form Affects User Data Integrity
CVE-2026-109165

5.3MEDIUM

Key Information:

Vendor

Tduckcloud

Status
Tduck-survey-form
Vendor
CVE Published:
12 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-109165?

The TDuck Survey Form up to version 6.0 is susceptible to a broken access control issue that enables authenticated users to manipulate other users' forms. This vulnerability permits an attacker to submit a crafted request to the endpoint POST /user/form/item/batch/create, allowing them to inject unwanted fields into another user's public fill page. The exploitation involves constructing an array where the first entry pertains to the attacker's form and subsequent entries link to the victim's formKey. This results in unauthorized data being included in the victim's submissions, posing a significant risk to user data integrity and privacy.

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-2026-109165 - Proof of Concept

References

https://github.com/AnkesKasty/cve-request-poc/blob/a7b6d1...
exploit
https://github.com/TDuckCloud/tduck-survey-form/blob/43ff...
technical-description
https://www.vulncheck.com/advisories/tduck-survey-form-th...
third-party-advisory

CVSS V4

Score:
5.3
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
.