CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Lifecycle Timeline
1DescriptionNVD
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.
AnalysisAI
Remote attackers can manipulate payment amounts in Stripe and PayPal transactions through the MetForm Pro WordPress plugin by submitting arbitrary values in the 'mf-calculation' field, bypassing price validation. Versions up to 3.9.7 are affected; the plugin fails to recompute or validate user-submitted calculation fields against configured form prices, allowing unauthenticated attackers to reduce or alter payment amounts on vulnerable forms. …
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External POC / Exploit Code
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EUVD-2026-22851