CVE-2026-100303: TDuck survey form through 6.0 lacks authorization checks on FormThemeController write endpoints for global form themes and categories. Authe

Executive brief

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.

References

• https://github.com/TDuckCloud/tduck-survey-form
• https://github.com/LinYuanyi1/cve-request-poc/blob/adffc39b78cad18cd489cbf7454853bf0f744b7f/tduck/poc_form_theme_write.py