---
id: CVE-2026-109165
title: >-
  TDuck survey form through 6.0 contains a broken access control vulnerability
  that allows authenticated users to add fields to other users' forms via POST
  /user/form/item/batch/create
summary: >-
  TDuck survey form through 6.0 contains a broken access control vulnerability
  that allows authenticated users to add fields to other users' forms via POST
  /user/form/item/batch/create. Attackers can submit an array whose first
  element ref…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'
cwe:
  - CWE-639
published: '2026-10-12'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T13:17:28.613'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109165'
references:
  - url: >-
      https://github.com/AnkesKasty/cve-request-poc/blob/a7b6d1423555812d8efa26c91c5d0683164b31e5/tduck/poc_form_item_batch_create_cross_form.py
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/TDuckCloud/tduck-survey-form/blob/43ffa9c993e38936fc4de7d8e5aee82bbaa19502/tduck-api/src/main/java/com/tduck/cloud/api/web/controller/UserFormController.java#L327-L336
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/tduck-survey-form-through-6.0-authorization-bypass-via-user-controlled-form-key-in-post-user-form-item-batch-create
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-12T14:50:34.110Z'
---

## Overview

TDuck survey form through 6.0 contains a broken access control vulnerability that allows authenticated users to add fields to other users' forms via POST /user/form/item/batch/create. Attackers can submit an array whose first element references their own form and later elements reference a victim's formKey, injecting attacker-chosen fields onto the victim's public fill page.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.