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CVE-2026-109165— TDuck survey form through 6.0 Authorization Bypass via User-Controlled Form Key in POST /user/form/item/batch/create

Quick assessment

Affected
TDuckCloud tduck-survey-form
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

TDuck 调查表单（版本 6.0 及之前）存在一处访问控制缺陷漏洞。攻击者可通过向 接口提交构造的数据包，以已认证用户的身份在其他用户的表单中插入自定义字段。具体来说，攻击者可以提交一个数组，其中第一个元素引用其自身的表单，后续元素引用受害者的表单键（formKey），从而将攻击者自定义的字段注入到受害者表单的公开填写页面中。

CVSS 4.3 · Medium EPSS 0.24% · P14

Affected Version Matrix 1

VendorProduct Version RangeStatus
TDuckCloud tduck-survey-form ≤ 6.0 affected
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I. Basic Information for CVE-2026-109165

Vulnerability Information
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Vulnerability Title
TDuck survey form through 6.0 Authorization Bypass via User-Controlled Form Key in POST /user/form/item/batch/create
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
TDuckCloud tduck-survey-form 0 ~ 6.0 -

II. Public POCs for CVE-2026-109165

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III. Intelligence Information for CVE-2026-109165

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Patches & Fixes for CVE-2026-109165 (1)

Proof of Concept for CVE-2026-109165 (1)

Other References for CVE-2026-109165 (1)

Same Patch Batch · TDuckCloud · 2026-10-12 · 3 CVEs total

CVE-2026-109164 7.1 HIGH TDuck survey form through 6.0 Authorization Bypass via User-Controlled Submission IDs in P
CVE-2026-109167 4.3 MEDIUM TDuck survey form through 6.0 Authorization Bypass via User-Controlled Theme ID in POST /u

IV. Related Vulnerabilities

Same product: tduck-survey-form
Same vendor: TDuckCloud
Same weakness: CWE-639

V. Comments for CVE-2026-109165

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