---
id: CVE-2026-100306
title: >-
  TDuck survey form through 6.0 fails to validate write passwords on submission
  endpoints, enforcing the check only on the front end
summary: >-
  TDuck survey form through 6.0 fails to validate write passwords on submission
  endpoints, enforcing the check only on the front end. Remote unauthenticated
  attackers can submit form entries directly to public submission APIs without
  provi…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'
cwe:
  - CWE-602
vendor: TDuckCloud
product: tduck-survey-form
affected:
  - tduck-survey-form <= 6.0
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T19:16:51.167'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100306'
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#L152-L172
    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/UserFormSettingController.java#L154-L162
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/tduck-survey-form-through-6.0-write-password-bypass-via-client-side-enforcement
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-25T19:15:38.964Z'
---

## Overview

TDuck survey form through 6.0 fails to validate write passwords on submission endpoints, enforcing the check only on the front end. Remote unauthenticated attackers can submit form entries directly to public submission APIs without providing the password by using the form key from share links.

## Remediation

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