CVE-2026-76547: Unknown User Profile Builder

Medium severity, CVSS 6.6. EPSS: 0.4% chance of exploitation in the next 30 days.

The User Profile Builder WordPress plugin before 4.0.1 does not validate the type of data being deserialized when importing a configuration file, allowing high privilege users such as administrators to conduct PHP Object Injection. The affected feature is a free add-on which is disabled by default, and no POP chain is present in the User Profile Builder WordPress plugin before 4.0.1 itself, so further impact requires a suitable gadget from another installed User Profile Builder WordPress plugin before 4.0.1 or .

Affected products

• Unknown User Profile Builder: from 3.3.4, before 4.0.1 (fixed in 4.0.1)

Published 2026-08-29. Last modified 2026-08-31.