Mitigation Strategies

To mitigate this vulnerability, you should update the Ultimate Member plugin for WordPress to a version later than 2.11.2 where the issue is fixed.

Additionally, restrict Contributor-level access and above from creating or previewing posts that contain the '[um_loggedin]' shortcode or the '{usermeta:password_reset_link}' template tag until the update is applied.

Monitor and audit user roles and permissions to limit the risk of malicious pending posts being created and previewed by administrators.

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Compliance Impact

This vulnerability allows authenticated attackers with Contributor-level access to generate and exfiltrate password reset tokens of Administrator accounts, leading to full account takeover.

Such unauthorized access and potential compromise of administrator accounts can lead to exposure of sensitive personal data managed through the WordPress site.

Consequently, this poses a risk to compliance with data protection regulations like GDPR and HIPAA, which require safeguarding sensitive information and preventing unauthorized access.

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Executive Summary

The Ultimate Member plugin for WordPress has a vulnerability in all versions up to and including 2.11.2. This vulnerability arises because the '{usermeta:password_reset_link}' template tag is processed within post content via the '[um_loggedin]' shortcode. This processing generates a valid password reset token for the currently logged-in user viewing the page.

An authenticated attacker with Contributor-level access or higher can exploit this by creating a malicious pending post. When an Administrator previews this post, it generates a password reset token for the Administrator and sends it to an attacker-controlled server. This allows the attacker to take over the Administrator's account.

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Impact Analysis

This vulnerability can lead to a full account takeover of Administrator accounts on a WordPress site using the Ultimate Member plugin. An attacker with Contributor-level access can craft a malicious post that, when previewed by an Administrator, exposes the Administrator's password reset token to the attacker.

With this token, the attacker can reset the Administrator's password and gain complete control over the site, potentially leading to unauthorized access, data theft, site defacement, or further exploitation.

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