The Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.8.6. This is due to missing or incorrect nonce validation on the admin_init or user_action_hook function. This makes it possible for unauthenticated attackers to modify a users membership status via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

The Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'um_loggedin' shortcode in all versions up to, and including, 2.8.6 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Cross-Site Request Forgery (CSRF) vulnerability in Ultimate Member plugin <= 2.6.0 versions.

The Ultimate Member WordPress plugin before 2.6.7 does not prevent visitors from creating user accounts with arbitrary capabilities, effectively allowing attackers to create administrator accounts at will. This is actively being exploited in the wild.

The Ultimate Member plugin for WordPress is vulnerable to Remote Code Execution in versions up to, and including, 2.5.0 via the populate_dropdown_options function that accepts user supplied input and passes it through call_user_func(). This is restricted to non-parameter PHP functions like phpinfo(); since user supplied parameters are not passed through the function. This makes it possible for authenticated attackers, with administrative privileges, to execute code on the server.

The Ultimate Member plugin for WordPress is vulnerable to Remote Code Execution in versions up to, and including, 2.5.0 via the get_option_value_from_callback function that accepts user supplied input and passes it through call_user_func(). This makes it possible for authenticated attackers, with administrative capabilities, to execute code on the server.

The Ultimate Member plugin for WordPress is vulnerable to directory traversal in versions up to, and including 2.5.0 due to insufficient input validation on the 'template' attribute used in shortcodes. This makes it possible for attackers with administrative privileges to supply arbitrary paths using traversal (../../) to access and include files outside of the intended directory. If an attacker can successfully upload a php file then remote code execution via inclusion may also be possible. Note: for users with less than administrative capabilities, /wp-admin access needs to be enabled for that user in order for this to be exploitable by those users.

A vulnerability, which was classified as critical, has been found in Ultimate Member Plugin up to 2.5.0. This issue affects the function load_template of the file includes/core/class-shortcodes.php of the component Template Handler. The manipulation of the argument tpl leads to pathname traversal. The attack may be initiated remotely. Upgrading to version 2.5.1 is able to address this issue. The name of the patch is e1bc94c1100f02a129721ba4be5fbc44c3d78ec4. It is recommended to upgrade the affected component. The identifier VDB-213545 was assigned to this vulnerability.

The Ultimate Member plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Biography field featured on individual user profile pages due to insufficient input sanitization and output escaping that allows users to encode malicious web scripts with HTML encoding that is reflected back on the page. This affects versions up to, and including, 2.3.2. Please note this issue was only partially fixed in version 2.3.2.

The Ultimate Member plugin for WordPress is vulnerable to arbitrary redirects due to insufficient validation on supplied URLs in the social fields of the Profile Page, which makes it possible for attackers to redirect unsuspecting victims in versions up to, and including, 2.3.1.

The Ultimate Member – User Profile, User Registration, Login & Membership Plugin WordPress plugin before 2.1.20 did not properly sanitise, validate or encode the query string when generating a link to edit user's own profile, leading to an authenticated reflected Cross-Site Scripting issue. Knowledge of the targeted username is required to exploit this, and attackers would then need to make the related logged in user open a malicious link.

The Ultimate Member plugin before 2.1.13 for WordPress mishandles hidden name="timestamp" fields in forms.

An issue was discovered in the Ultimate Member plugin before 2.1.12 for WordPress, aka Unauthenticated Privilege Escalation via User Roles. Due to the lack of filtering on the role parameter that could be supplied during the registration process, an attacker could supply the role parameter with a WordPress capability (or any custom Ultimate Member role) and effectively be granted those privileges.

An issue was discovered in the Ultimate Member plugin before 2.1.12 for WordPress, aka Authenticated Privilege Escalation via Profile Update. Any user with wp-admin access to the profile.php page could supply the parameter um-role with a value set to any role (e.g., Administrator) during a profile update, and effectively escalate their privileges.

An issue was discovered in the Ultimate Member plugin before 2.1.12 for WordPress, aka Unauthenticated Privilege Escalation via User Meta. An attacker could supply an array parameter for sensitive metadata, such as the wp_capabilities user meta that defines a user's role. During the registration process, submitted registration details were passed to the update_profile function, and any metadata was accepted, e.g., wp_capabilities[administrator] for Administrator access.

Multiple Insecure Direct Object Reference vulnerabilities in includes/core/class-files.php in the Ultimate Member plugin through 2.1.2 for WordPress allow remote attackers to change other users' profiles and cover photos via a modified user_id parameter. This is related to ajax_image_upload and ajax_resize_image.

The ultimate-member plugin before 2.0.52 for WordPress has XSS during an account upgrade.

The ultimate-member plugin before 2.0.52 for WordPress has XSS related to UM Roles create and edit operations.

The ultimate-member plugin before 2.0.54 for WordPress has XSS.

The ultimate-member plugin before 2.0.4 for WordPress has XSS.