Vulnerability · Published Oct 16, 2026 · Assigned by VulnCheck
CVE-2026-111621TDuck Survey Form through 5.3 Missing Authorization via /user/form/setting/{key}
Medium 4.3
In plain English
A medium-severity authorization bypass via user-controlled key in tduck-survey-form from TDuckCloud. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities).
Official description
TDuck Survey Form through 5.3 contains a missing authorization vulnerability that allows any authenticated user to read other owners' raw form settings via GET /user/form/setting/{key}. Attackers can supply the 8-character form key from a public fill link to obtain the form write password, owner notification e-mail, and WeChat openIds.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| TDuckCloud | tduck-survey-form | 0 – through 5.3 |
Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
References
- https://hackmd.io/@hieuPenguinnn/tduck-survey-form-setting-cross-user-disclosure third-party-advisory
- https://github.com/TDuckCloud/tduck-survey-form/blob/5.3/tduck-api/src/main/java/com/tduck/cloud/api/web/controller/UserFormSettingController.java#L66-L75 technical-description
- https://github.com/TDuckCloud/tduck-survey-form/commit/984efd69f51778e3d1a9ea0feb0f7c9aed266c18 patch
- https://github.com/TDuckCloud/tduck-survey-form product
- VulnCheck Advisory: TDuck Survey Form through 5.3 Missing Authorization via /user/form/setting/{key} third-party-advisory