CVE-2025-58639 is a medium-severity vulnerability classified under CWE-862 (Missing Authorization) affecting the WordPress plugin 'Contact Form By Mega Forms' developed by Ali Khallad. This vulnerability arises due to improperly configured access control mechanisms within the plugin, allowing users with limited privileges (PR:L - privileges required: low) to perform actions that should be restricted. The CVSS v3.1 base score is 5.4, reflecting a network attack vector (AV:N), low attack complexity (AC:L), no user interaction required (UI:N), and an impact limited to integrity and availability (I:L, A:L) without confidentiality loss (C:N). The scope remains unchanged (S:U), meaning the vulnerability affects only the vulnerable component and does not extend to other components. The affected versions include all versions up to 1.6.1, though exact version details are unspecified (n/a). The vulnerability allows an attacker with low privileges to exploit incorrect access control settings, potentially modifying or disrupting form data or functionality, which could lead to denial of service or data integrity issues within the contact forms on affected WordPress sites. No known exploits are currently reported in the wild, and no patches have been linked yet, indicating that the vulnerability is newly disclosed and may require immediate attention from site administrators using this plugin.

For European organizations, especially those relying on WordPress websites with the 'Contact Form By Mega Forms' plugin, this vulnerability poses a risk to the integrity and availability of contact form data and services. Attackers with low-level access—potentially authenticated users with minimal privileges—could manipulate form submissions, disrupt communication channels, or cause denial of service conditions. This could affect customer interaction, lead to loss of business opportunities, or damage organizational reputation. Since contact forms often serve as primary communication points for customers and partners, any disruption or data manipulation could have operational and compliance implications, particularly under GDPR where data integrity and availability are critical. The absence of confidentiality impact reduces the risk of data leakage but does not eliminate the threat to service reliability and trustworthiness.

1. Immediate review and restriction of user privileges on WordPress sites using the 'Contact Form By Mega Forms' plugin to ensure that only trusted users have access to form management features. 2. Monitor and audit user activities related to the plugin to detect any unauthorized modifications or disruptions. 3. Temporarily disable or replace the plugin with alternative contact form solutions until an official patch is released. 4. Follow vendor communications closely for patch releases or security advisories and apply updates promptly once available. 5. Implement web application firewall (WAF) rules to detect and block suspicious requests targeting the plugin endpoints. 6. Conduct penetration testing focused on access control mechanisms in the plugin to identify any other potential weaknesses. 7. Educate site administrators and users about the risks of privilege escalation and enforce strong authentication and authorization policies.