Medium severity · published Sep 25, 2026
CVE-2026-100304
TDuck survey form 6.0 Information Disclosure via Fail-Open Form Ownership Check
5.3
CVSS
0.4%
EPSS
No
On KEV
Description
TDuck survey form 6.0 contains an information disclosure vulnerability in FormAuthUtils.hasPermission that fails open when a form does not exist, allowing authenticated users to access deleted form submissions. Attackers can read orphaned submission data including personal information by providing a known dataId to the GET /user/form/data/details endpoint after the form has been permanently deleted.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TD
tduck-survey-form · TDuckCloud
6.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-100304
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-100304
exploit
https://github.com/LinYuanyi1/cve-request-poc/blob/adffc39b78cad18cd489cbf7454853bf0f744b7f/tduck/poc_form_data_details_orphan.py
product
https://github.com/TDuckCloud/tduck-survey-form
technical-description
https://github.com/TDuckCloud/tduck-survey-form/blob/43ffa9c993e38936fc4de7d8e5aee82bbaa19502/tduck-form/src/main/java/com/tduck/cloud/form/util/FormAuthUtils.java#L25-L39
technical-description
https://github.com/TDuckCloud/tduck-survey-form/blob/43ffa9c993e38936fc4de7d8e5aee82bbaa19502/tduck-form/src/main/java/com/tduck/cloud/form/service/impl/UserFormDataServiceImpl.java#L169-L187
technical-description
https://github.com/TDuckCloud/tduck-survey-form/blob/43ffa9c993e38936fc4de7d8e5aee82bbaa19502/tduck-api/src/main/java/com/tduck/cloud/api/web/controller/UserFormController.java#L451-L459
third-party-advisory
https://www.vulncheck.com/advisories/tduck-survey-form-6.0-information-disclosure-via-fail-open-form-ownership-check
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7.1
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6.5
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5.4
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5.3
CVE-2026-100306
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