CVE-2026-109165: Authorization Bypass Through User-Controlled Key in TDuckCloud tduck-survey-form
Description
TDuck survey form through 6.0 contains a broken access control vulnerability that allows authenticated users to add fields to other users' forms via POST /user/form/item/batch/create. Attackers can submit an array whose first element references their own form and later elements reference a victim's formKey, injecting attacker-chosen fields onto the victim's public fill page.
CVSS v4.0
Score 5.3medium
Affected software
TDuckCloud
tduck-survey-form
pkg:github/tduck-survey-formRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-109165 describes a broken access control vulnerability in TDuckCloud's tduck-survey-form up to version 6.0. Authenticated users can exploit the POST /user/form/item/batch/create endpoint by submitting an array where the first element references their own form and subsequent elements reference a victim's formKey. This allows injection of arbitrary fields into the victim's public survey form, bypassing authorization controls.
Potential Impact
An attacker with authentication privileges can modify other users' survey forms by injecting fields, potentially altering the data collection process or misleading survey respondents. The vulnerability does not require user interaction or elevated privileges beyond authentication, but it may impact data integrity and trust in the survey forms.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the affected endpoint and monitor for suspicious activity related to form modifications.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-12T12:41:06.299Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6accde4d2cdf04f65696c09f
Added to database: 10/12/2026, 13:19:09 UTC
Last enriched: 10/12/2026, 13:48:14 UTC
Last updated: 10/12/2026, 21:47:26 UTC
Views: 12
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