CVE-2026-84934: Unknown Jch Optimize

High severity, CVSS 8.0. EPSS: 0.4% chance of exploitation in the next 30 days.

The JCH Optimize WordPress plugin before 6.0.1 does not perform a capability check on one of its authenticated AJAX actions and lets the request choose which internal action runs, allowing any authenticated users such as Subscribers to import arbitrary JCH Optimize WordPress plugin before 6.0.1 settings and store a script that executes in the browser of any visitor or administrator viewing the site.

Affected products

• Unknown Jch Optimize: before 6.0.1 (fixed in 6.0.1)

Published 2026-09-05. Last modified 2026-09-08.