CVE-2025-58639 Overview
CVE-2025-58639 is a missing authorization vulnerability in the Contact Form By Mega Forms WordPress plugin developed by Ali Khallad. The flaw affects all plugin versions up to and including 1.6.1. The vulnerability stems from incorrectly configured access control security levels, categorized under [CWE-862]. Authenticated attackers with low privileges can exploit the flaw over the network to affect integrity and availability of the plugin's protected functionality.
Critical Impact
Authenticated users with minimal privileges can access plugin functions that should require elevated permissions, enabling unauthorized modification of form data and configuration.
Affected Products
- Ali Khallad Contact Form By Mega Forms (mega-forms) plugin for WordPress
- All versions from initial release through 1.6.1
- WordPress sites with the plugin active and accepting authenticated users
Discovery Timeline
- 2025-09-03 - CVE-2025-58639 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-58639
Vulnerability Analysis
The Contact Form By Mega Forms plugin exposes plugin actions without verifying that the requesting user holds the required capability. WordPress plugins must enforce capability checks using current_user_can() and validate nonces on state-changing operations. This plugin omits or misconfigures those checks on one or more endpoints. An attacker authenticated as a low-privilege user, such as a subscriber, can invoke actions intended for administrators or form managers.
The impact is limited to integrity and availability of plugin-managed resources. Confidentiality is not affected according to the CVSS vector. Exploitation does not require user interaction beyond the attacker's own authenticated session.
Root Cause
The root cause is broken access control [CWE-862]. Plugin action handlers do not verify the caller's WordPress role or capability before executing privileged operations. In WordPress plugin architecture, this typically occurs when developers register AJAX handlers with wp_ajax_* hooks or REST routes without a permission_callback that enforces role checks.
Attack Vector
Exploitation requires an authenticated WordPress account with low privileges. The attacker sends crafted HTTP requests to the vulnerable plugin endpoints. Because access control is not enforced, the plugin processes the request as if it originated from an authorized user. See the Patchstack Vulnerability Report for additional technical context.
No public proof-of-concept code is available at the time of publication. The vulnerability mechanism is described in prose based on the Patchstack advisory.
Detection Methods for CVE-2025-58639
Indicators of Compromise
- Unexpected changes to Mega Forms form definitions, submissions, or settings performed by non-administrator accounts.
- WordPress audit log entries showing subscriber or contributor accounts invoking mega-forms AJAX actions or REST endpoints.
- Newly created or modified form entries outside of normal administrative workflows.
Detection Strategies
- Review web server access logs for POST requests to admin-ajax.php or /wp-json/ paths referencing mega-forms originating from low-privilege session cookies.
- Correlate authenticated user IDs in application logs with the roles of those users at the time of the request.
- Deploy WordPress activity logging plugins to record capability-sensitive actions performed by non-admin roles.
Monitoring Recommendations
- Alert on any modification to plugin configuration or form schema by accounts below the editor role.
- Monitor for anomalous HTTP request rates from authenticated sessions targeting plugin endpoints.
- Track plugin version inventory across WordPress sites to identify hosts running mega-forms at or below version 1.6.1.
How to Mitigate CVE-2025-58639
Immediate Actions Required
- Update the Contact Form By Mega Forms plugin to a version later than 1.6.1 once the vendor publishes a fix.
- Audit WordPress user accounts and remove or downgrade unused low-privilege accounts that could be leveraged for exploitation.
- Restrict user registration on sites where anonymous account creation is not required.
Patch Information
At the time of publication, the Patchstack advisory lists versions through 1.6.1 as affected. Administrators should monitor the plugin's WordPress.org page and the Patchstack database for a patched release and apply it as soon as it becomes available.
Workarounds
- Deactivate and remove the Contact Form By Mega Forms plugin until a patched version is available if the risk is unacceptable.
- Use a web application firewall rule to block requests to mega-forms AJAX and REST endpoints from sessions associated with non-administrator roles.
- Disable open user registration in WordPress general settings to reduce the pool of low-privilege attackers.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
