CVE-2026-109167mediumCWE-639

CVE-2026-109167: medium-severity vulnerability in TDuckCloud tduck-survey-form

TDuck survey form through 6.0 Authorization Bypass via User-Controlled Theme ID in POST /user/form/theme/save

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33Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 5.3epss 0.2%
TDuck survey form through 6.0 contains an insecure direct object reference vulnerability in the saveFormTheme handler that allows authenticated users to overwrite other users' form themes. Attackers whose form has no theme can submit another form's sequential theme id with their own formKey, replacing its colours and image URLs and removing the victim's theme.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Affected products
TDuckCloud · tduck-survey-form
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — TDuckCloud tduck-survey-form

In the same product, most dangerous first.

CVE-2026-92567HIGHTDuck survey form through 5.0 Unauthorized Data ModificationEPSS 0.4%CVE-2026-92602HIGHTDuck survey form through 5.3 Server-Side Request Forgery via Unvalidated Webhook URLEPSS 0.4%CVE-2026-100306MEDIUMTDuck survey form through 6.0 Write Password Bypass via Client-Side EnforcementEPSS 0.4%CVE-2026-100304MEDIUMTDuck survey form 6.0 Information Disclosure via Fail-Open Form Ownership CheckEPSS 0.4%CVE-2026-109164HIGHTDuck survey form through 6.0 Authorization Bypass via User-Controlled Submission IDs in POST /user/form/data/delete/{formKey}EPSS 0.3%CVE-2026-100303MEDIUMTDuck survey form through 6.0 Missing Authorization in Form Theme Management EndpointsEPSS 0.3%