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CVE-2026-1782— MetForm Pro <= 3.9.7 - Unauthenticated Payment Amount Manipulation via 'mf-calculation'

Quick assessment

Affected
Wpmet MetForm Pro
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin MetForm Pro 3.9.7及之前版本存在安全漏洞，该漏洞源于支付集成信任用户提交的计算字段值而未重新计算或验证，可能导致未经身份验证的攻击者操纵支付金额。

CVSS 5.3 · Medium EPSS 0.27% · P17

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-1782

Vulnerability Information
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Vulnerability Title
MetForm Pro <= 3.9.7 - Unauthenticated Payment Amount Manipulation via 'mf-calculation'
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress plugin MetForm Pro 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin MetForm Pro 3.9.7及之前版本存在安全漏洞，该漏洞源于支付集成信任用户提交的计算字段值而未重新计算或验证，可能导致未经身份验证的攻击者操纵支付金额。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Wpmet MetForm Pro 0 ~ 3.9.7 -

II. Public POCs for CVE-2026-1782

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III. Intelligence Information for CVE-2026-1782

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Vendor Advisories for CVE-2026-1782 (1)

IV. Related Vulnerabilities

Same product: MetForm Pro
Same vendor: Wpmet
Same weakness: CWE-20

V. Comments for CVE-2026-1782

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