Auth bypass in Tduckcloud Tduck-Survey-Form
CVE-2026-100303
TDuck survey form through 6.0 lacks authorization checks on FormThemeController write endpoints for global form themes and categories. Authenticated non-admin users can add, modify, or delete themes and theme categories affecting forms owned by other users.
Vulnerability class: Broken Access Control
Published .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.
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)
- www.vulncheck.com/advisories/tduck-survey-form-through-6.0-missing-authorizatio… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100303?
- CVE-2026-100303 is a medium-severity vulnerability in Tduckcloud Tduck-Survey-Form, classified under Missing Authorization. CVSS score: 5.4/10. Published 2026-09-25.
- How severe is CVE-2026-100303?
- Medium severity. CVSS v3 base score is 5.4 out of 10.