Medium severity · published Sep 25, 2026
CVE-2026-100303
TDuck survey form through 6.0 Missing Authorization in Form Theme Management Endpoints
5.4
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TD
tduck-survey-form · TDuckCloud
through 6.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-100303
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-100303
exploit
https://github.com/LinYuanyi1/cve-request-poc/blob/adffc39b78cad18cd489cbf7454853bf0f744b7f/tduck/poc_form_theme_write.py
product
https://github.com/TDuckCloud/tduck-survey-form
technical-description
https://github.com/TDuckCloud/tduck-survey-form/blob/43ffa9c993e38936fc4de7d8e5aee82bbaa19502/tduck-api/src/main/java/com/tduck/cloud/api/web/controller/FormThemeController.java#L61-L120
third-party-advisory
https://www.vulncheck.com/advisories/tduck-survey-form-through-6.0-missing-authorization-in-form-theme-management-endpoints
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TDuck survey form through 6.0 Authorization Bypass via User-Controlled Submission IDs in POST /user/form/data/delete/{formKey}
7.1
CVE-2026-92602
TDuck survey form through 5.3 Server-Side Request Forgery via Unvalidated Webhook URL
6.5
CVE-2026-92567
TDuck survey form through 5.0 Unauthorized Data Modification
5.3
CVE-2026-100306
TDuck survey form through 6.0 Write Password Bypass via Client-Side Enforcement
5.3
CVE-2026-100304
TDuck survey form 6.0 Information Disclosure via Fail-Open Form Ownership Check