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 · 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:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (19.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
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)
- VulnCheck Advisory: TDuck survey form through 6.0 Fill-In Restriction Bypass via Authenticated Submission Endpoint (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.