Improper Input Validation in MetForm Pro Plugin for WordPress
CVE-2026-1782

5.3MEDIUM

Key Information:

Vendor

WordPress
Status
Metform Pro
Vendor
CVE Published:
15 April 2026

What is CVE-2026-1782?

The MetForm Pro plugin for WordPress is susceptible to improper input validation across all versions up to and including 3.9.7. The vulnerability arises from the plugin’s payment integrations (Stripe/PayPal), which inadequately validate a user-submitted calculation field against predefined pricing. This flaw allows unauthenticated attackers to exploit the 'mf-calculation' field within form submission REST requests, thereby modifying payment amounts if a specific form is configured to rely on this susceptible calculation method.

Affected Version(s)

MetForm Pro 0 <= 3.9.7

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://wpmet.com/plugin/metform/

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

andrea bocchetti
.