CVE-2026-1782: CWE-20 Improper Input Validation in Wpmet MetForm Pro
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.
AI Analysis
Technical Summary
The MetForm Pro plugin for WordPress versions up to 3.9.7 contains an improper input validation vulnerability (CWE-20) in its payment integrations with Stripe and PayPal. The plugin accepts a user-supplied 'mf-calculation' field value in REST API form submissions without recomputing or validating it against the expected form price. This flaw enables unauthenticated attackers to alter the payment amount by manipulating this field, potentially bypassing intended payment restrictions. The vulnerability has a CVSS 3.1 base score of 5.3, indicating medium severity. No patch or official remediation level has been published as of the vulnerability disclosure date.
Potential Impact
The vulnerability allows unauthenticated attackers to manipulate payment amounts submitted through the MetForm Pro plugin's payment integrations. This could lead to attackers paying less than intended or bypassing payment requirements on forms configured to use the vulnerable calculation field. There is no indication of confidentiality or availability impact. No known exploits in the wild have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should consider disabling payment integrations or restricting access to vulnerable forms to trusted users only. Monitoring vendor channels for updates is recommended.
CVE-2026-1782: CWE-20 Improper Input Validation in Wpmet MetForm Pro
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The MetForm Pro plugin for WordPress versions up to 3.9.7 contains an improper input validation vulnerability (CWE-20) in its payment integrations with Stripe and PayPal. The plugin accepts a user-supplied 'mf-calculation' field value in REST API form submissions without recomputing or validating it against the expected form price. This flaw enables unauthenticated attackers to alter the payment amount by manipulating this field, potentially bypassing intended payment restrictions. The vulnerability has a CVSS 3.1 base score of 5.3, indicating medium severity. No patch or official remediation level has been published as of the vulnerability disclosure date.
Potential Impact
The vulnerability allows unauthenticated attackers to manipulate payment amounts submitted through the MetForm Pro plugin's payment integrations. This could lead to attackers paying less than intended or bypassing payment requirements on forms configured to use the vulnerable calculation field. There is no indication of confidentiality or availability impact. No known exploits in the wild have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should consider disabling payment integrations or restricting access to vulnerable forms to trusted users only. Monitoring vendor channels for updates is recommended.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-02-02T21:00:18.963Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69df540182d89c981fbdb3d0
Added to database: 4/15/2026, 9:01:53 AM
Last enriched: 4/15/2026, 9:17:50 AM
Last updated: 4/16/2026, 6:19:31 AM
Views: 10
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.