Vulnerability · Published Sep 16, 2026 · Assigned by VulnCheck
CVE-2026-92567TDuck survey form through 5.0 Unauthorized Data Modification
Medium 6.5
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 0.4% (higher than 37% of all known vulnerabilities).
Official description
TDuck survey form through version 5.0 contains an authorization bypass vulnerability in the POST /user/form/data/update endpoint that allows authenticated users to overwrite other users' form submission data. Attackers can discover submission identifiers allocated in narrow ranges and modify arbitrary form responses containing personal data by sending update requests without ownership validation.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| TDuckCloud | tduck-survey-form | 0 – through 5.0 |
Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
References
- GitHub Issue #39 issue-tracking
- https://github.com/TDuckCloud/tduck-survey-form product
- https://github.com/TDuckCloud/tduck-survey-form/blob/9ad4e2dc75cdff5eacc8be0c73f0d4db3c265d43/tduck-api/src/main/java/com/tduck/cloud/api/web/controller/UserFormResultController.java#L198-L207 technical-description
- https://github.com/TDuckCloud/tduck-survey-form/blob/9ad4e2dc75cdff5eacc8be0c73f0d4db3c265d43/tduck-form/src/main/java/com/tduck/cloud/form/service/impl/UserFormDataServiceImpl.java#L158-L167 technical-description
- VulnCheck Advisory: TDuck survey form through 5.0 Unauthorized Data Modification third-party-advisory