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Description

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.

PUBLISHED Reserved 2026-02-02 | Published 2026-04-15 | Updated 2026-04-15 | Assigner Wordfence




MEDIUM: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Problem types

CWE-20 Improper Input Validation

Product status

Default status
unaffected

Any version
affected

Timeline

2026-02-12:Vendor Notified
2026-04-14:Disclosed

Credits

andrea bocchetti finder

References

www.wordfence.com/...-6ae8-49ed-9e8a-e5b73c2acf4b?source=cve

wpmet.com/plugin/metform/

cve.org (CVE-2026-1782)

nvd.nist.gov (CVE-2026-1782)

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