CVE-2026-15368: Unknown User Profile Builder

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

The User Profile Builder WordPress plugin before 3.16.4 does not correctly bind the automatic login performed after user registration to the newly created account, allowing unauthenticated attackers to obtain an authenticated session for an arbitrary existing user, including administrators, on sites using a supported but non-default configuration.

Affected products

• Unknown User Profile Builder: before 3.16.4 (fixed in 3.16.4)

Published 2026-08-01. Last modified 2026-08-26.