CVE-2026-12394 Scanner

The MemberGlut WordPress Plugin is widely used to enhance membership management functionalities in WordPress sites. It allows website owners to easily manage user registration and access levels directly through front-end interfaces. The plugin is popular among administrators looking to create sophisticated membership sites without extensive technical knowledge. WordPress, paired with the MemberGlut plugin, powers numerous membership-based and exclusive content websites globally. The integration of such plugins significantly extends WordPress's capability, permitting customization to meet specific site needs. For any WordPress-based membership site, security and registration control become critical, especially when plugins control significant authorization roles like this one.

The vulnerability detected in the MemberGlut WordPress Plugin allows unauthenticated privilege escalation. This arises due to a breakdown in access controls; more specifically, it occurs when user roles are not validated during the registration process. Unauthorized users can exploit this flaw to register with arbitrary roles, including administrative roles, without any authentication. This critical defect presents a high-risk scenario as it directly affects site access and control, potentially enabling full site compromise. The vulnerability showcases a lack of role validation, emphasizing the importance of secure registration processes.

Technically, the vulnerability lies within the registration functionality endpoint. The endpoint is supposed to validate user roles, but it fails in this instance due to a missing validation check, letting unauthenticated requests define high-level roles such as 'administrator'. By exploiting the unchecked 'default_role' parameter during registration, attackers can manipulate POST requests to escalate privileges. The exploit involves intercepting and modifying registration data packets, thereby challenging the conventional role assignment mechanism. Such oversights in frontend registration can have substantial repercussions if not promptly addressed.

When such vulnerabilities are exploited, the repercussions include an attacker being able to acquire administrative roles on the WordPress site. This grants them comprehensive control, allowing them to install malware, alter site content, create backdoors, and potentially steal sensitive user information. Moreover, an attacker working covertly could maintain persistent, undetectable access to the backend of the site, undermining user trust and leading to reputational damage. Ultimately, these security gaps risk the entire integrity and confidentiality of the affected site.

REFERENCES

• https://wpscan.com/vulnerability/6b126a3e-30d5-4bed-ba47-33e589ec2852/
• https://plugins.trac.wordpress.org/browser/memberglut/tags/1.1.0/includes/class-memberglut-forms.php
• https://plugins.trac.wordpress.org/browser/memberglut/tags/1.1.5/includes/class-memberglut-forms.php
• https://nvd.nist.gov/vuln/detail/CVE-2026-12394