CVE-2026-19859: Unknown Jetformbuilder

Medium severity, CVSS 6.5. EPSS: 0.2% chance of exploitation in the next 30 days.

The JetFormBuilder WordPress plugin before 3.6.5.2 does not sanitize a request parameter before rendering it as message content, allowing unauthenticated users to execute arbitrary shortcodes registered on the site on any page displaying a form. Escaping is applied to that content before a later shortcode-expansion pass rather than after it, so the escaping can be bypassed.

Affected products

• Unknown Jetformbuilder: before 3.6.5.2 (fixed in 3.6.5.2)

Published 2026-09-06. Last modified 2026-09-08.