EUVD-2026-87291Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable, low-complexity, needs a low-privilege authenticated account (PR:L); no confidentiality impact, and only limited integrity/availability tampering of shared theme resources.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
4DescriptionCVE.org
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.
AnalysisAI
Authenticated non-admin users can add, modify, or delete global form themes and theme categories in TDuck Survey Form through 6.0 because the FormThemeController write endpoints enforce neither an administrative role nor ownership of the affected theme resources. The flaw is a missing-authorization (CWE-862) issue reachable by any holder of a valid low-privilege account (CVSS 4.0 vector PR:L, AV:N, AC:L, UI:N) with no confidentiality impact - only integrity and availability effects on themes shared across other users' forms. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated non-admin account on a TDuck survey-form instance (through version 6.0); the attacker then invokes the FormThemeController write endpoints (add/modify/delete theme or theme category) which lack any admin-role or ownership authorization check. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The NVD CVSS 4.0 base score of 5.3 (AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L) is credible and well-calibrated: it correctly scopes impact to integrity and availability only (no confidentiality), reflecting that this is a missing-authorization/IDOR flaw where a low-privileged authenticated user (PR:L) can tamper with globally-shared form themes and categories. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch was identified at time of analysis, so administrators must compensate for the missing authorization. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-862 – Missing Authorization
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External POC / Exploit Code
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