---
id: CVE-2026-100304
title: >-
  TDuck survey form 6.0 contains an information disclosure vulnerability in
  FormAuthUtils.hasPermission that fails open when a form does not exist,
  allowing authenticated users to access deleted form submissions
summary: >-
  TDuck survey form 6.0 contains an information disclosure vulnerability in
  FormAuthUtils.hasPermission that fails open when a form does not exist,
  allowing authenticated users to access deleted form submissions. Attackers can
  read orphane…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-636
vendor: TDuckCloud
product: tduck-survey-form
affected:
  - tduck-survey-form 6.0
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T19:16:50.797'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100304'
references:
  - url: >-
      https://github.com/LinYuanyi1/cve-request-poc/blob/adffc39b78cad18cd489cbf7454853bf0f744b7f/tduck/poc_form_data_details_orphan.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/UserFormController.java#L451-L459
    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/UserFormDataServiceImpl.java#L169-L187
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/TDuckCloud/tduck-survey-form/blob/43ffa9c993e38936fc4de7d8e5aee82bbaa19502/tduck-form/src/main/java/com/tduck/cloud/form/util/FormAuthUtils.java#L25-L39
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/tduck-survey-form-6.0-information-disclosure-via-fail-open-form-ownership-check
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-25T19:15:38.966Z'
---

## Overview

TDuck survey form 6.0 contains an information disclosure vulnerability in FormAuthUtils.hasPermission that fails open when a form does not exist, allowing authenticated users to access deleted form submissions. Attackers can read orphaned submission data including personal information by providing a known dataId to the GET /user/form/data/details endpoint after the form has been permanently deleted.

## Remediation

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