CVE-2026-100306 TDuckCloud CVE debrief

Who should care

Defenders responsible for TDuck survey form deployments should assess their exposure and prioritize verification and remediation efforts to prevent unauthorized form submissions. This includes reviewing the current version of the TDuck survey form, identifying potential vulnerabilities, and implementing necessary security measures to protect against exploitation. Additionally, defenders should consider upgrading to a version of TDuck survey form that enfor

Why it matters

CVE-2026-100306 allows remote unauthenticated attackers to bypass write password validation in TDuck survey form versions up to 6.0, enabling unauthorized form submissions. Defenders should verify their environment's exposure, especially if using affected versions, and prioritize server-side validation implementation and monitoring.

• Potential for unauthorized data submissions
• Risk of data integrity compromise
• Need for server-side validation implementation
• Requirement for monitoring and access control adjustments

Technical summary

The TDuck survey form through version 6.0 does not validate write passwords on submission endpoints, allowing remote unauthenticated attackers to bypass the password requirement by using the form key from share links. This vulnerability enables attackers to submit form entries directly to public submission APIs without providing the required password, potentially leading to unauthorized data submissions and compromising data integrity. Defenders should prioritize verifying the presence of this vulnerability in their environments, especially if using TDuck survey form versions up to 6.0, and assess the exposure of their systems to unauthenticated submission APIs.

Defensive priority

Defenders should prioritize verifying the presence of this vulnerability in their environments, especially if using TDuck survey form versions up to 6.0, and assess the exposure of their systems to unauthenticated submission APIs.

Recommended defensive actions

• Verify the version of TDuck survey form in use and assess exposure to unauthenticated submission APIs.
• Implement additional validation checks on the server-side to enforce write password requirements.
• Monitor for suspicious form submissions and adjust access controls as necessary.
• Consider upgrading to a version of TDuck survey form that enforces password validation on the server-side.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The evidence provided includes details from the CVE Program record, NVD vulnerability detail, and source references from [email protected], which describe the vulnerability and its potential impact.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.