Auth bypass in Tduckcloud Tduck-Survey-Form
CVE-2026-111621
TDuck Survey Form through 5.3 contains a missing authorization vulnerability that allows any authenticated user to read other owners' raw form settings via GET /user/form/setting/{key}. Attackers can supply the 8-character form key from a public fill link to obtain the form write password, owner notification e-mail, and WeChat openIds.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
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:L/I:N/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
- hackmd.io/@hieuPenguinnn/tduck-survey-form-setting-cross-user-disclosure (third-party-advisory)
- github.com/TDuckCloud/tduck-survey-form/blob/5.3/tduck-api/src/main/java/com/td… (technical-description)
- github.com/TDuckCloud/tduck-survey-form/commit/984efd69f51778e3d1a9ea0feb0f7c9a… (patch)
- github.com/TDuckCloud/tduck-survey-form (product)
- VulnCheck Advisory: TDuck Survey Form through 5.3 Missing Authorization via /user/form/setting/{key} (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111621?
- CVE-2026-111621 is a medium-severity vulnerability in Tduckcloud Tduck-Survey-Form, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-10-16.
- How severe is CVE-2026-111621?
- Medium severity. CVSS v3 base score is 4.3 out of 10.