CVE-2026-12251: Unknown Ultimate Member

High severity, CVSS 8.1. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Unknown Ultimate Member: before 2.12.1 (fixed in 2.12.1)

Published 2026-07-31. Last modified 2026-08-26.