CVE-2026-96366 in Webform Plugin
Summary
by MITRE • 10/22/2026
Incorrect Authorization vulnerability in Drupal Webform allows Forceful Browsing. This issue affects Webform versions: from 0.0.0 to 6.2.12, from 6.3.0 to 6.3.1.
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Analysis
by VulDB Data Team • 10/22/2026
The identified security flaw within the Drupal Webform module represents a critical failure in access control mechanisms, specifically categorized as an improper authorization vulnerability that facilitates forceful browsing or insecure direct object references. This issue impacts legacy versions of the software, including all releases from version 0.0.0 up to and including 6.2.12, as well as the specific range from 6.3.0 through 6.3.1. The core technical deficiency lies in the module's inability to adequately verify whether an authenticated user possesses the necessary privileges to access or manipulate specific form data or submission records. In a properly secured application, every request for sensitive resources must be validated against the current session's permissions and role assignments before any processing occurs. However, in these affected versions of Webform, the system fails to enforce this check consistently across all endpoints related to form submissions and configurations.
This architectural weakness allows an attacker who has valid authentication credentials but lacks administrative or specific editing rights to bypass intended restrictions by directly manipulating URL parameters or request payloads. By altering identifiers such as node IDs, submission IDs, or configuration keys within the HTTP requests sent to the server, a malicious actor can access data belonging to other users or modify form settings that should be restricted to administrators. This type of vulnerability is formally classified under CWE-284, which describes Improper Access Control, and aligns with the MITRE ATT&CK technique T1078, Valid Accounts, as it exploits legitimate credentials to perform unauthorized actions. The absence of robust server-side validation means that the application trusts client-supplied input regarding resource ownership without cross-referencing it against the user's actual permissions in the database or session state.
The operational impact of this vulnerability is significant for organizations relying on Drupal Webform for collecting sensitive information, such as personal identifiable data, financial details, or internal business processes. An attacker can exploit this flaw to exfiltrate confidential submission data from other users, leading to potential privacy violations and regulatory non-compliance with standards like GDPR or HIPAA depending on the nature of the collected data. Furthermore, the ability to modify form configurations without authorization could allow an adversary to alter field types, required status, or action handlers embedded in forms. This could lead to further exploitation vectors such as cross-site scripting if malicious content is injected into form fields that are later rendered by other users, or it could disrupt business operations by corrupting data structures and submission workflows. The lack of proper authorization checks effectively undermines the integrity and confidentiality guarantees provided by the application's authentication layer.
Mitigation strategies must prioritize immediate remediation through software updates rather than relying on temporary workarounds due to the fundamental nature of the flaw in the access control logic. Administrators running any version from 0.0.0 up to 6.2.12 or from 6.3.0 to 6.3.1 should upgrade immediately to a patched release where these authorization checks have been rigorously implemented and tested. If upgrading is not feasible in the short term, organizations can implement compensating controls at the web server level by restricting access to specific Webform endpoints based on IP addresses or requiring additional authentication factors for sensitive operations. Additionally, deploying a Web Application Firewall with rules tuned to detect patterns associated with forceful browsing attempts against form submission URLs may provide an interim layer of defense. Long-term security posture improvements should include regular code audits focusing on authorization logic and the adoption of principle of least privilege in application design to ensure that users only have access to resources strictly necessary for their role.