Vulnerability · Published Sep 25, 2026 · Assigned by VulnCheck
CVE-2026-100305TDuck survey form through 6.0 Fill-In Restriction Bypass via Authenticated Submission Endpoint
Medium 4.3
In plain English
A medium-severity missing authorization 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 0.3% (higher than 19% of all known vulnerabilities).
Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.3%top 81.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| TDuckCloud | tduck-survey-form | 0 – through 6.0 |
Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
References
- https://github.com/LinYuanyi1/cve-request-poc/blob/adffc39b78cad18cd489cbf7454853bf0f744b7f/tduck/poc_form_data_create_bypass.py exploit
- https://github.com/TDuckCloud/tduck-survey-form product
- https://github.com/TDuckCloud/tduck-survey-form/blob/43ffa9c993e38936fc4de7d8e5aee82bbaa19502/tduck-api/src/main/java/com/tduck/cloud/api/web/controller/UserFormResultController.java#L135-L172 technical-description
- https://github.com/TDuckCloud/tduck-survey-form/blob/43ffa9c993e38936fc4de7d8e5aee82bbaa19502/tduck-form/src/main/java/com/tduck/cloud/form/service/impl/UserFormSettingServiceImpl.java#L77-L135 technical-description
- VulnCheck Advisory: TDuck survey form through 6.0 Fill-In Restriction Bypass via Authenticated Submission Endpoint third-party-advisory