CVE-2026-11766

The Ultimate Member WordPress plugin is vulnerable to SQL Injection (Blind SQL Injection) due to improper neutralization of special elements in SQL commands. The issue affects versions from n/a through 2.13.1.

A deserialization of untrusted data vulnerability in the Ultimate Member WordPress plugin allows Object Injection. Affects versions up to and including 2.13.1.

The Ultimate Member plugin for WordPress in versions up to and including 2.13.1 contains an Incorrect Privilege Assignment vulnerability that allows Privilege Escalation. The issue affects all versions from n/a through 2.13.1.

Authorization bypass through user-controlled key vulnerability in Ultimate Member up to version 2.13.1. Allows privilege escalation.

The Ultimate Member plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'form_id' parameter in versions up to and including 2.13.1 due to insufficient input sanitization and output escaping. Unauthenticated attackers can inject scripts that execute when an administrator opens the user record in the wp-admin modal.

The Ultimate Member plugin for WordPress is vulnerable to authorization bypass in versions up to and including 2.13.1. Unauthenticated attackers can view privacy-restricted member profile field values, including owner-only, members-only, or role-restricted fields, by querying the public wp_ajax_nopriv_um_get_members endpoint. The nonce required by the endpoint is available to all visitors.

The Ultimate Member WordPress plugin before 2.13.1 does not escape a value derived from user supplied profile names before outputting it in the page title, and decodes HTML entities in it after its own sanitisation has already run, allowing unauthenticated attackers who register an account to store JavaScript that will execute when any visitor, including an administrator, views their profile.

The Ultimate Member WordPress plugin before version 2.13.0 does not check whether a comment has been approved or whether the profile it belongs to is private before returning profile activity to unauthenticated visitors. This allows reading the content of comments still awaiting moderation.

The Ultimate Member plugin for WordPress up to version 2.12.1 is vulnerable to Stored Cross-Site Scripting via Textarea Profile Field with HTML Support (DOM Gadget via id Attribute). Insufficient input sanitization and output escaping allow authenticated attackers with subscriber-level access and above to inject arbitrary web scripts that execute when a user accesses an injected page.

The Ultimate Member WordPress plugin before 2.12.1 does not filter administrator-level capabilities from the roles it makes selectable on its registration forms, and its post-registration safeguard against elevated accounts is disabled by default, allowing unauthenticated users to register with a site-defined role that carries administrator capabilities and gain administrative access, when such a role exists and a role-selection field is present on a published registration form.