Auth bypass in Tduckcloud Tduck-Survey-Form
CVE-2026-109165
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-109165?
- CVE-2026-109165 is a medium-severity vulnerability in Tduckcloud Tduck-Survey-Form, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-10-12.
- How severe is CVE-2026-109165?
- Medium severity. CVSS v3 base score is 4.3 out of 10.