What is CVE-2026-19857?

CVE-2026-19857 is a medium-severity vulnerability in Formidable Forms, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 4.8/10. Published 2026-09-16.

How severe is CVE-2026-19857?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in Formidable Forms

CVE-2026-19857

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.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Unknown Formidable Forms

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

References

contact@wpscan.com (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-19857?: CVE-2026-19857 is a medium-severity vulnerability in Formidable Forms, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 4.8/10. Published 2026-09-16.
How severe is CVE-2026-19857?: Medium severity. CVSS v3 base score is 4.8 out of 10.