Auth bypass in Tduckcloud Tduck-Survey-Form
CVE-2026-109167
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.
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-2026-109167?
- CVE-2026-109167 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-2026-109167?
- Medium severity. CVSS v3 base score is 4.3 out of 10.