# CVE-2026-109164: TDuck survey form insecure direct object reference in submission deletion

Source: https://junglewise.ai/threats/cve-2026-109164-tduck-survey-form-through-6-0-contains-an-insecure-direct-object  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-12. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-109164 · Severity: high · CVSS 7.1 · Published 2026-10-12

TDuck is a survey and form platform that organizations use to collect responses. An authenticated user can delete other users' form submissions by manipulating request parameters, potentially allowing them to erase evidence or disrupt data collection across the platform.

Technologies: [Tduckcloud Tduck-Survey-Form](https://junglewise.ai/threats/technologies/tduck-survey-form). Vendors: [Tduckcloud](https://junglewise.ai/threats/vendors/tduckcloud).

## Quick answers

**Is CVE-2026-109164 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-109164 being exploited in the wild.

**How severe is CVE-2026-109164?** High severity, with a CVSS score of 7.1, published 12 October 2026.

**Which products and versions are affected?** Tduckcloud Tduck-Survey-Form through 6.0.

**Is there a fix for CVE-2026-109164?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-109164 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-109164?** Check whether you run Tduckcloud Tduck-Survey-Form at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an insecure direct object reference (IDOR) in the POST /user/form/data/delete/{formKey} endpoint. The application verifies the user owns the formKey from the URL, but then deletes submission records using only IDs from the request body without re-validating the formKey, allowing any authenticated user to delete submissions from any form by iterating sequential submission IDs.

## Affected products

- TDuckCloud tduck-survey-form through 6.0

## Timeline

- 2026-10-12: disclosed

## References

- [https://github.com/TDuckCloud/tduck-survey-form](https://github.com/TDuckCloud/tduck-survey-form)
- [https://github.com/AnkesKasty/cve-request-poc/blob/a7b6d1423555812d8efa26c91c5d0683164b31e5/tduck/poc_form_data_delete_idor.py](https://github.com/AnkesKasty/cve-request-poc/blob/a7b6d1423555812d8efa26c91c5d0683164b31e5/tduck/poc_form_data_delete_idor.py)

## Related threats

- [TDuck survey form insecure direct object reference in saveFormTheme](https://junglewise.ai/threats/cve-2026-109167-tduck-survey-form-through-6-0-contains-an-insecure-direct-object)
- [TDuck survey form password validation bypass in submission endpoints](https://junglewise.ai/threats/cve-2026-100306-tduck-survey-form-through-6-0-fails-to-validate-write-passwords)
- [TDuck survey form authentication bypass in form submission](https://junglewise.ai/threats/cve-2026-100305-tduck-survey-form-through-6-0-fails-to-enforce-form-fill-in)
- [TDuck survey form information disclosure in FormAuthUtils](https://junglewise.ai/threats/cve-2026-100304-tduck-survey-form-6-0-contains-an-information-disclosure)
- [TDuck FormThemeController authorization bypass in form themes](https://junglewise.ai/threats/cve-2026-100303-tduck-survey-form-through-6-0-lacks-authorization-checks-on)