CVE-2026-19116: Unknown User Frontend

High severity, CVSS 8.8. EPSS: 0.4% chance of exploitation in the next 30 days.

The User Frontend WordPress plugin before 4.3.11 does not prevent user-supplied field values from being deserialized when a submitted post is reopened in its frontend editing form, allowing authenticated users with subscriber-level access and above to perform PHP Object Injection, which may lead to remote code execution when a suitable gadget chain is present on the site.

Affected products

• Unknown User Frontend: before 4.3.11 (fixed in 4.3.11)

Published 2026-09-02. Last modified 2026-09-03.