MetForm Pro <= 3.9.7 — Unauthenticated Payment Amount Manipulation via 'mf-calculation'
CVE-2026-1782Published · Updated Action summary
Affected: ≤3.9.7Update to 3.9.8 or newer
All remediation steps- Severity
- Medium5.3
- CVSS
- 5.3CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:NUser interaction- None
S:UScope- Unchanged
C:NConfidentiality- None
I:LIntegrity- Low
A:NAvailability- None
- Weakness
- CWE-20 Improper Input Validation
- Required access
- No account needed
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
MetForm Pro metform-pro
- Affected≤ 3.9.7
- Patched in3.9.8
Update to 3.9.8 or newer.
You are affected if you run ≤ 3.9.7. Version 3.9.8 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under MetForm Pro.
- No admin access? Run a passive check of your site. It reads public files only.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- Update to version 3.9.8, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch MetForm Pro to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to andrea bocchetti.
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.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in MetForm Pro
All 4| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium5.3 | Missing Authorization ≤3.9.8Update to 3.9.9 | CVE-2026-24611 | |
| High7.2 | Unauthenticated Stored Cross-Site Scripting ≤3.9.6Update to 3.9.7 | CVE-2026-1261 | |
| Medium4.3 | Missing Authorization ≤3.9.8Update to 3.9.9 | CVE-2026-24610 |
- Medium5.3Missing Authorization
≤3.9.8Update to 3.9.9
- High7.2Unauthenticated Stored Cross-Site Scripting
≤3.9.6Update to 3.9.7
- Medium4.3Missing Authorization
≤3.9.8Update to 3.9.9
Timeline
CVE published
Severity medium, CVSS 5.3
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.