Vulnerability · Published Sep 25, 2026 · Assigned by VulnCheck
CVE-2026-100304TDuck survey form 6.0 Information Disclosure via Fail-Open Form Ownership Check
Medium 5.3
In plain English
A medium-severity security flaw in tduck-survey-form from TDuckCloud. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities).
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| TDuckCloud | tduck-survey-form | 6.0 |
Weakness: CWE-636 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
References
- https://github.com/LinYuanyi1/cve-request-poc/blob/adffc39b78cad18cd489cbf7454853bf0f744b7f/tduck/poc_form_data_details_orphan.py exploit
- https://github.com/TDuckCloud/tduck-survey-form product
- https://github.com/TDuckCloud/tduck-survey-form/blob/43ffa9c993e38936fc4de7d8e5aee82bbaa19502/tduck-form/src/main/java/com/tduck/cloud/form/util/FormAuthUtils.java#L25-L39 technical-description
- https://github.com/TDuckCloud/tduck-survey-form/blob/43ffa9c993e38936fc4de7d8e5aee82bbaa19502/tduck-form/src/main/java/com/tduck/cloud/form/service/impl/UserFormDataServiceImpl.java#L169-L187 technical-description
- https://github.com/TDuckCloud/tduck-survey-form/blob/43ffa9c993e38936fc4de7d8e5aee82bbaa19502/tduck-api/src/main/java/com/tduck/cloud/api/web/controller/UserFormController.java#L451-L459 technical-description
- VulnCheck Advisory: TDuck survey form 6.0 Information Disclosure via Fail-Open Form Ownership Check third-party-advisory