EUVD-2026-87294Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/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
Remote, unauthenticated, no interaction against a public API (AV:N/AC:L/PR:N/UI:N); impact limited to unauthorized data submission so I:L with C:N/A:N.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
4DescriptionCVE.org
TDuck survey form through 6.0 fails to validate write passwords on submission endpoints, enforcing the check only on the front end. Remote unauthenticated attackers can submit form entries directly to public submission APIs without providing the password by using the form key from share links.
AnalysisAI
Missing server-side enforcement of the write/submission password in TDuck survey form through 6.0 allows remote unauthenticated attackers to post form entries directly to the public submission API, because the password gate is implemented only in front-end JavaScript. An attacker only needs the form key that is exposed in any public share link; no account, no user interaction, and no special configuration are required. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitable only against TDuck survey forms that use the write/submission password protection feature; the attacker must possess the form key, which is exposed in the form's public share link. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but modest-severity control-bypass flaw. … 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 version is identified in the available data - the upstream references point only at the vulnerable source at commit 43ffa9c - so the primary fix is to have the write password validated server-side on the submission endpoints (mirroring the check in UserFormSettingController inside UserFormResultController's entry-creation path) rather than trusting front-end JavaScript, and to track the vendor repository for a fix commit or release. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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