CVE-2026-9017 in NEX-Forms Plugin
Summary
by MITRE • 07/11/2026
The NEX-Forms – Ultimate Forms Plugin for WordPress plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 9.2.2. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for unauthenticated attackers to overwrite the saved_admin_email, saved_user_email, and saved_user_email_address fields of arbitrary form entries belonging to other users, and cause the site to dispatch attacker-controlled email content to attacker-chosen recipient addresses.
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Analysis
by VulDB Data Team • 07/11/2026
The NEX-Forms plugin for WordPress represents a widely used form building solution that has been identified with a critical authorization bypass vulnerability affecting all versions up to and including 9.2.2. This vulnerability stems from inadequate user authentication verification mechanisms within the plugin's core functionality, creating a fundamental security flaw that undermines the integrity of user data management and email communication systems. The issue manifests in the plugin's failure to properly validate user permissions before allowing modifications to form entry data, particularly targeting sensitive email configuration fields that control automated email dispatch operations.
The technical exploitation of this vulnerability occurs through the manipulation of form entry fields without proper authentication requirements, specifically targeting three critical configuration parameters: saved_admin_email, saved_user_email, and saved_user_email_address. These fields typically store recipient addresses for automated email notifications that are triggered when form submissions are processed. The flaw allows unauthenticated attackers to overwrite these fields with arbitrary email addresses, effectively hijacking the email delivery system of legitimate user forms. This authorization bypass vulnerability directly maps to CWE-863, which defines "Incorrect Authorization" as a weakness where the software does not properly verify that an actor is authorized to perform a requested action. The vulnerability's impact extends beyond simple data manipulation, as it enables attackers to control the email communication flow of legitimate website users.
The operational consequences of this vulnerability are severe and multifaceted, creating opportunities for both data exfiltration and social engineering attacks through controlled email content delivery. Attackers can exploit the compromised system to redirect notification emails to their own addresses, potentially gaining access to sensitive information submitted through forms that would normally be sent to legitimate administrators or users. The ability to inject attacker-controlled email content into automated notification systems creates a vector for phishing campaigns, spam distribution, and further exploitation of the compromised website. This vulnerability also undermines trust in the website's form submission system and can lead to reputational damage when users receive unexpected or malicious emails from the compromised site.
Mitigation strategies for this authorization bypass vulnerability should prioritize immediate plugin updates to versions that address the authentication verification flaw, while implementing additional defensive measures such as network-level access controls and monitoring of email delivery patterns. Organizations should conduct comprehensive audits of their form submission systems to identify any unauthorized modifications to email configuration fields and implement proper input validation for all user-facing form parameters. Network security controls including web application firewalls should be configured to monitor for unusual patterns in form data submissions that might indicate exploitation attempts. The vulnerability's classification under ATT&CK technique T1078.004, which covers "Valid Accounts: Cloud Accounts," highlights the importance of maintaining proper access controls and monitoring account behavior. Additionally, implementing principle of least privilege access controls for administrative functions and regular security assessments of third-party plugins can help prevent similar authorization bypass scenarios from occurring in other WordPress installations.