---
id: CVE-2026-100305
title: >-
  TDuck survey form through 6.0 fails to enforce form fill-in restrictions on
  the authenticated submission endpoint POST /user/form/data/create
summary: >-
  TDuck survey form through 6.0 fails to enforce form fill-in restrictions on
  the authenticated submission endpoint POST /user/form/data/create.
  Authenticated attackers who know a form's key can submit unlimited entries to
  any form, bypass…
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-862
vendor: TDuckCloud
product: tduck-survey-form
affected:
  - tduck-survey-form <= 6.0
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T19:16:50.973'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100305'
references:
  - url: >-
      https://github.com/LinYuanyi1/cve-request-poc/blob/adffc39b78cad18cd489cbf7454853bf0f744b7f/tduck/poc_form_data_create_bypass.py
    label: disclosure@vulncheck.com
  - url: 'https://github.com/TDuckCloud/tduck-survey-form'
    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/UserFormResultController.java#L135-L172
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/TDuckCloud/tduck-survey-form/blob/43ffa9c993e38936fc4de7d8e5aee82bbaa19502/tduck-form/src/main/java/com/tduck/cloud/form/service/impl/UserFormSettingServiceImpl.java#L77-L135
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/tduck-survey-form-through-6.0-fill-in-restriction-bypass-via-authenticated-submission-endpoint
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-25T19:06:44.808090Z'
ingestedAt: '2026-09-25T19:15:38.962Z'
---

## Overview

TDuck survey form through 6.0 fails to enforce form fill-in restrictions on the authenticated submission endpoint POST /user/form/data/create. Authenticated attackers who know a form's key can submit unlimited entries to any form, bypassing publish status, time window, quota, and per-IP restrictions to falsify collected results.

## Remediation

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