CVE-2026-109165

Medium

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.

SeverityMedium

CVSS4.3

Exploit probability—

ProductTduckcloud Tduck-survey-form

PublishedOct 12, 2026

First seenOct 12, 2026

Weakness typeCWE-639Authorization bypass through user-controlled key

How to fix

Sources list no fixed version or patch link for this vulnerability.

Affected products

Product	Affected versions	Fixed in
TDuckCloud tduck-survey-form	v ≤ 6.0	—

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