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CVE-2026-4987— SureForms <= 2.5.2 - Unauthenticated Payment Amount Validation Bypass via 'form_id'

Quick assessment

Affected
brainstormforce SureForms – Contact Form, Payment Form & Other Custom Form Builder
Exploitation
Public or AI PoC available; prioritize validation
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 SureForms 2.5.2及之前版本存在输入验证错误漏洞，该漏洞源于create_payment_intent函数仅基于用户控制参数进行支付验证，可能导致未经验证的攻击者绕过支付金额验证。

CVSS 7.5 · High EPSS 1.16% · P66

Public Exploits 1

Nuclei · 1 CVE-2026-4987.yaml [template]

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-4987

Vulnerability Information
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Vulnerability Title
SureForms <= 2.5.2 - Unauthenticated Payment Amount Validation Bypass via 'form_id'
Source: CVE Program / CVE List V5
Vulnerability Description
The SureForms – Contact Form, Payment Form & Other Custom Form Builder plugin for WordPress is vulnerable to Payment Amount Bypass in all versions up to, and including, 2.5.2. This is due to the create_payment_intent() function performing a payment validation solely based on the value of a user-controlled parameter. This makes it possible for unauthenticated attackers to bypass configured form payment-amount validation and create underpriced payment/subscription intents by setting form_id to 0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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 SureForms 输入验证错误漏洞
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 SureForms 2.5.2及之前版本存在输入验证错误漏洞，该漏洞源于create_payment_intent函数仅基于用户控制参数进行支付验证，可能导致未经验证的攻击者绕过支付金额验证。
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
brainstormforce SureForms – Contact Form, Payment Form & Other Custom Form Builder * ~ 2.5.2 -

II. Public POCs for CVE-2026-4987

# POC Description Source Link Shenlong Link
1 The SureForms plugin for WordPress is vulnerable to payment amount validation bypass in versions up to, and including, 2.5.2. The create_payment_intent AJAX handler checks `if ($form_id > 0 && !empty($block_id))` before calling validate_payment_amount(). By sending form_id=0 (the default intval of a missing/zero value), an unauthenticated attacker completely skips the server-side amount validation and can create Stripe payment intents with arbitrary amounts, bypassing configured pricing. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-4987.yaml POC Details
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III. Intelligence Information for CVE-2026-4987

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Patches & Fixes for CVE-2026-4987 (1)

Vendor Advisories for CVE-2026-4987 (1)

IV. Related Vulnerabilities

Same product: SureForms – Contact Form, Payment Form & Other Custom Form Builder
Same vendor: brainstormforce
Same weakness: CWE-20

V. Comments for CVE-2026-4987

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