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CVE-2026-19857

Formidable Forms < 6.35 - Unauthenticated Arbitrary Shortcode Execution via [entry_key] Custom HTML Token

CVSS 3.1 4.8 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-19857

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-19857

Published

Formidable Forms

https://wordpress.org/plugins

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Unknown",
                    "product": "Formidable Forms",
                    "versions": [
                        {
                            "status": "affected",
                            "versionType": "semver",
                            "version": "6.34",
                            "lessThan": "6.35"
                        }
                    ],
                    "defaultStatus": "unaffected",
                    "collectionURL": "https://wordpress.org/plugins"
                }

Original source record · Cite this exact observation · Complete original publisher JSON