CVE-2026-92602 in TDuck Survey Form
Summary
by MITRE • 09/16/2026
TDuck survey form through version 5.3 fails to validate webhook URLs or verify form ownership in the WebhookConfigController. Authenticated attackers can attach webhooks to other users' forms and exfiltrate submissions to arbitrary external or internal addresses.
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Analysis
by VulDB Data Team • 09/17/2026
The vulnerability identified in TDuck Survey Form versions prior to 5.3 represents a critical failure in access control logic, specifically within the WebhookConfigController component of the application architecture. This flaw stems from an insufficient validation mechanism that fails to verify whether the authenticated user initiating a webhook configuration request is the legitimate owner or authorized administrator of the target survey form. In secure web applications, any action that modifies sensitive configurations such as data exfiltration endpoints must be strictly bound to the resource ownership context. The absence of this check allows for an insecure direct object reference scenario where the application trusts the user's session identity without cross-referencing it against the permissions associated with the specific form identifier provided in the request parameters. This architectural oversight effectively bypasses standard authorization protocols, treating any authenticated credential as sufficient permission to alter settings on any accessible resource within the system scope.
From a technical perspective, this vulnerability enables an attacker who has obtained valid authentication credentials for any user account to manipulate webhook configurations belonging to other users or administrative accounts. By crafting specific HTTP requests that target the WebhookConfigController endpoints with form identifiers not owned by their own session, attackers can inject malicious URLs into the survey submission pipeline. These injected webhooks act as data exfiltration channels, automatically forwarding every new response submitted through the affected forms to an external server controlled by the attacker or potentially to internal network addresses if SSRF capabilities are leveraged in conjunction with this flaw. The severity of this issue is compounded by the fact that it does not require privilege escalation; a low-privileged user can compromise high-value data simply by knowing the form identifiers, which may be discoverable through enumeration or social engineering tactics.
The operational impact of this vulnerability is severe, primarily centering on confidentiality and integrity violations. Survey forms often collect sensitive personal information, financial details, health records, or proprietary business intelligence depending on the organization's use case. The ability to redirect these submissions allows for mass data theft without triggering typical intrusion detection alerts associated with direct database queries or file downloads. Furthermore, if attackers configure webhooks pointing to internal services, they may facilitate further lateral movement within a corporate network by exploiting server-side request forgery vulnerabilities in downstream systems that process the webhook payloads. This transforms a simple configuration error into a potential gateway for broader system compromise and persistent data leakage across organizational boundaries.
To mitigate this vulnerability, immediate action must be taken to upgrade TDuck Survey Form to version 5.3 or later where these access control checks have been implemented. In environments where upgrading is not immediately feasible, administrators should implement strict input validation on the server side to ensure that any webhook configuration request includes a verification step confirming the requester's ownership of the target form ID. Additionally, deploying web application firewalls with rules targeting unauthorized modification attempts on configuration endpoints can provide temporary protection. It is also recommended to audit existing webhook configurations for anomalies and rotate credentials if there is evidence of prior exploitation. Adhering to OWASP guidelines regarding broken access control and implementing robust identity verification workflows will prevent similar issues in future development cycles, ensuring that data exfiltration vectors are systematically closed at the application logic layer rather than relying solely on perimeter defenses.