CVE-2026-1948 in NEX-Forms Plugin
Summary
by MITRE • 03/16/2026
The NEX-Forms – Ultimate Forms Plugin for WordPress plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the deactivate_license() function in all versions up to, and including, 9.1.9. This makes it possible for authenticated attackers, with Subscriber-level access and above, to to deactivate the plugin license.
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Analysis
by VulDB Data Team • 03/16/2026
The vulnerability identified as CVE-2026-1948 affects the NEX-Forms – Ultimate Forms Plugin for WordPress, representing a critical authorization flaw that undermines the security posture of affected systems. This issue stems from a fundamental missing capability check within the deactivate_license() function, which is a core component of the plugin's licensing mechanism. The vulnerability exists across all versions up to and including 9.1.9, indicating a prolonged period during which this security weakness remained unaddressed. The flaw specifically targets the plugin's license management functionality, creating an unauthorized access vector that could have significant operational implications for users relying on this form-building solution.
The technical implementation of this vulnerability demonstrates a clear failure in privilege validation within the plugin's codebase. The deactivate_license() function lacks proper capability verification, allowing authenticated users with Subscriber-level access or higher to execute license deactivation commands without appropriate authorization. This represents a direct violation of the principle of least privilege, where users should only have access to functions commensurate with their assigned roles. The missing capability check creates a scenario where lower-privileged users can manipulate core plugin functionality that should typically be restricted to administrators or users with specific licensing permissions. This flaw aligns with CWE-284, which addresses improper access control mechanisms in software applications, specifically focusing on inadequate privilege checks and authorization validation.
From an operational perspective, this vulnerability presents substantial risk to organizations using the affected WordPress plugin, as it enables unauthorized modification of critical licensing data. An attacker with Subscriber-level access can potentially disrupt legitimate licensing arrangements, leading to service interruptions or unauthorized license modifications that could impact the plugin's functionality. The implications extend beyond simple data modification, as license deactivation could result in service degradation or complete loss of functionality for the form-building capabilities that organizations depend upon. This vulnerability creates a potential attack vector for malicious actors who might exploit it to gain further control over the affected systems or to disrupt business operations through service availability impacts.
The security implications of this vulnerability are particularly concerning given that it affects a widely used plugin within the WordPress ecosystem, where many organizations rely on third-party extensions for core business functionalities. The fact that this vulnerability exists in all versions up to 9.1.9 suggests that organizations may have been exposed to this risk for an extended period without awareness. This lack of immediate patching or capability validation demonstrates a gap in the plugin's security monitoring and maintenance practices. Organizations should consider implementing additional monitoring for unauthorized license modifications and establish clear procedures for identifying and responding to such security incidents. The vulnerability also highlights the importance of regular security assessments of third-party plugins and the necessity of maintaining up-to-date security practices within WordPress environments.
Mitigation strategies for this vulnerability should focus on immediate remediation through plugin updates to versions that address the missing capability check. Organizations should also implement network monitoring to detect unauthorized license modification attempts and establish privileged access controls to limit who can perform administrative functions within the WordPress environment. The implementation of proper logging and audit trails for license-related activities would provide visibility into potential exploitation attempts. Additionally, organizations should consider implementing role-based access controls that restrict the capabilities available to lower-privileged users, ensuring that only authorized personnel can perform license management functions. This vulnerability serves as a reminder of the critical importance of capability validation in security-sensitive functions and the need for comprehensive security testing of all plugin components before deployment in production environments.