The MetForm Pro plugin for WordPress is vulnerable to Improper Input Validation in all versions up to, and including, 3.9.7 This is due to the payment integrations (Stripe/PayPal) trusting a user-submitted calculation field value without recomputing or validating it against the configured form price. This makes it possible for unauthenticated attackers to manipulate the payment amount via the 'mf-calculation' field in the form submission REST request granted there exists a specific form with this particular configuration.
CVE-2026-1782 is a medium severity with CVSS 5.3 Vulnerability issue affecting the Plugin MetForm Pro. It affects Versions up to 3.9.7 and is fixed in 3.9.8.
CVE-2026-1782 is tracked for the Plugin MetForm Pro as medium severity with CVSS 5.3. The affected range is Versions up to 3.9.7. Update MetForm Pro to 3.9.8 or newer where that version is compatible with the site.
| Software Type | Plugin |
|---|---|
| Software Slug |
metform-pro
View on wordpress.org
|
| CVE | CVE-2026-1782 |
| Patched Versions |
3.9.8
|
| Affected Versions |
Versions up to 3.9.7
|
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