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CVE-2026-109167— TDuck survey form through 6.0 Authorization Bypass via User-Controlled Theme ID in POST /user/form/theme/save

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调查表单系统6.0及以下版本在saveFormTheme处理程序中存在一个不安全的直接对象引用（IDOR）漏洞，允许经过身份验证的用户覆盖其他用户的表单主题。攻击者的表单如果当前没有设置主题，则可以提交其他表单的顺序主题ID，并附带自身的formKey，从而替换目标表单的颜色和图片URL，并移除受害者原有的主题。

CVSS 4.3 · Medium EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
TDuckCloud tduck-survey-form ≤ 6.0 affected
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I. Basic Information for CVE-2026-109167

Vulnerability Information
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Vulnerability Title
TDuck survey form through 6.0 Authorization Bypass via User-Controlled Theme ID in POST /user/form/theme/save
Source: CVE Program / CVE List V5
Vulnerability Description
TDuck survey form through 6.0 contains an insecure direct object reference vulnerability in the saveFormTheme handler that allows authenticated users to overwrite other users' form themes. Attackers whose form has no theme can submit another form's sequential theme id with their own formKey, replacing its colours and image URLs and removing the victim's theme.
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-2026-109167

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III. Intelligence Information for CVE-2026-109167

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Patches & Fixes for CVE-2026-109167 (1)

Vendor Advisories for CVE-2026-109167 (1)

Proof of Concept for CVE-2026-109167 (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-2026-109165 4.3 MEDIUM TDuck survey form through 6.0 Authorization Bypass via User-Controlled Form Key in POST /u

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-109167

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