CVE-2026-19857: Unknown Formidable Forms

Medium severity, CVSS 4.8. EPSS: 0.2% chance of exploitation in the next 30 days.

The Formidable Forms WordPress plugin before 6.35 does not prevent a request-derived value from reaching the WordPress shortcode parser when it substitutes a supported token into a form's custom HTML, allowing unauthenticated visitors to have arbitrary shortcodes, with attacker-chosen attributes, executed server-side on any page displaying an affected form.

Affected products

• Unknown Formidable Forms: from 6.34, before 6.35 (fixed in 6.35)

Published 2026-09-16. Last modified 2026-09-16.