CVE-2026-100305: TDuck survey form through 6.0 Fill-In Restriction Bypass via Authenticated Submission Endpoint
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.
Affected Software
Event History
Frequently Asked Questions
Who can exploit this issue?
Any authenticated TDuck user who knows a target form's key can exploit it. The issue affects forms regardless of their publish status, allowed submission window, quota, or per-IP restriction.
What access and interaction does exploitation require?
An attacker needs valid authentication and the form key. They can submit requests to POST /user/form/data/create; no victim interaction is required.
What is the practical impact?
An attacker can submit unlimited entries to a target form and falsify its collected results. The provided severity vector indicates integrity impact only, with no stated confidentiality or availability impact.
How can I determine whether submissions may have bypassed restrictions?
Review submissions created through the authenticated POST /user/form/data/create endpoint for entries that occurred while a form was unpublished, outside its configured time window, beyond its quota, or beyond intended per-IP limits.