Auth bypass in Tduckcloud Tduck-Survey-Form
CVE-2026-100305
TDuck survey form through 6.0 fails to enforce form fill-in restrictions on the authenticated submission endpoint POST /user/form/data/create. Authenticated attackers who know a form's key can submit unlimited entries to any form, bypassing publish status, time window, quota, and per-IP restrictions to falsify collected results.
Vulnerability class: Broken Access Control
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
- github.com/LinYuanyi1/cve-request-poc/blob/adffc39b78cad18cd489cbf7454853bf0f74… (exploit)
- github.com/TDuckCloud/tduck-survey-form (product)
- github.com/TDuckCloud/tduck-survey-form/blob/43ffa9c993e38936fc4de7d8e5aee82bba… (technical-description)
- github.com/TDuckCloud/tduck-survey-form/blob/43ffa9c993e38936fc4de7d8e5aee82bba… (technical-description)
- www.vulncheck.com/advisories/tduck-survey-form-through-6.0-fill-in-restriction-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100305?
- CVE-2026-100305 is a medium-severity vulnerability in Tduckcloud Tduck-Survey-Form, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-09-25.
- How severe is CVE-2026-100305?
- Medium severity. CVSS v3 base score is 4.3 out of 10.