CVE-2026-18547
MediumCVSS 6.4Exploitation Probability (EPSS)
Low risk11th percentile - higher than 11% of all known CVEs
Summary
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.
Risk Assessment
An attacker can steal session data, take over user accounts, or perform other malicious actions in the victim's browser context. The vulnerability can be exploited to target administrators and other users.
Recommendation
Upgrade the Ultimate Member plugin to a version later than 2.12.1 that includes sanitization and escaping fixes.
Other vulnerabilities in Ultimate Member
See all- CVE-2026-12251High
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.
- CVE-2026-15290High
The Ultimate Member plugin for WordPress is vulnerable to blind SQL injection via the search parameter in all versions up to and including 2.10.1 due to insufficient escaping and lack of query preparation. This allows unauthenticated attackers to append additional SQL queries and extract sensitive information from the database.
- CVE-2026-11766High
The Ultimate Member WordPress plugin before version 2.12.0 fails to properly sanitize and escape custom textarea profile field values before outputting them on user profiles. This allows authenticated users with Subscriber-level access and above to store JavaScript that executes when any user, including an administrator, views the affected profile.
- CVE-2026-8489Medium
The Ultimate Member plugin for WordPress is vulnerable to stored XSS via the 'about_me' parameter in versions up to 2.11.4 inclusive due to insufficient input sanitization and output escaping.
- CVE-2025-15064Medium
The Ultimate Member plugin for WordPress up to version 2.11.1 is vulnerable to stored cross-site scripting (XSS) via the user description field due to insufficient input sanitization and output escaping. Authenticated attackers with subscriber-level access or higher can inject arbitrary scripts that execute when a user visits an affected page. The vulnerability is exploitable only when "HTML support for user description" is enabled in Ultimate Member settings.
Original NVD description (English source)
The Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Textarea Profile Field with HTML Support (DOM Gadget via id Attribute) in all versions up to, and including, 2.12.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is possible because the wp_kses 'templates' allowlist permits the id attribute on div elements but does not neutralize unescaped quotes within its value; when pickadate.js concatenates the stored id value into an HTML string via jQuery .html() on profile page load, the smuggled onfocus and autofocus attribute syntax breaks out of attribute context and executes as JavaScript.