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CVE-2026-9189— Contact Form 7 – PayPal & Stripe Add-on <= 2.4.9 - Unauthenticated Payment Bypass via Insufficient Verification of Data Authenticity via PayPal IPN Handler ('invoice'/'mc_gross' Verification)

CVSS 5.3 · Medium EPSS 0.20% · P11

Affected Version Matrix 1

VendorProductVersion RangeStatus
scottpatersonContact Form 7 – PayPal & Stripe Add-on≤ 2.4.9affected
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I. Basic Information for CVE-2026-9189

Vulnerability Information
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Vulnerability Title
Contact Form 7 – PayPal & Stripe Add-on <= 2.4.9 - Unauthenticated Payment Bypass via Insufficient Verification of Data Authenticity via PayPal IPN Handler ('invoice'/'mc_gross' Verification)
Source: CVE Program / CVE List V5
Vulnerability Description
The Contact Form 7 – PayPal & Stripe Add-on plugin for WordPress is vulnerable to Payment Bypass via Insufficient Verification of Data Authenticity in all versions up to, and including, 2.4.9. Although `cf7pp_paypal_ipn_handler()` correctly validates IPN authenticity by posting back to PayPal with `cmd=_notify-validate`, it fails to compare the IPN payload's `mc_gross` (payment amount), `mc_currency`, or `receiver_email` fields against the corresponding stored order values before passing the attacker-controlled `invoice` field directly to `cf7pp_complete_payment()`, which marks the order completed after only an integer cast with no amount verification. This makes it possible for unauthenticated attackers to mark arbitrary high-value pending orders as fully paid by making a minimal real PayPal payment and crafting an IPN whose `invoice` parameter references the targeted order, effectively completing purchases without tendering the required payment amount.
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
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress plugin Contact Form 7 – PayPal & Stripe Add-on 数据伪造问题漏洞
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 Contact Form 7 – PayPal & Stripe Add-on 2.4.9及之前版本存在数据伪造问题漏洞，该漏洞源于支付金额验证不足，可能导致未经验证的攻击者绕过支付。
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

VendorProductAffected VersionsCPESubscribe
scottpatersonContact Form 7 – PayPal & Stripe Add-on 0 ~ 2.4.9 -

II. Public POCs for CVE-2026-9189

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III. Intelligence Information for CVE-2026-9189

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Patches & Fixes for CVE-2026-9189 (4)

Vendor Advisories for CVE-2026-9189 (1)

Other References for CVE-2026-9189 (1)

IV. Related Vulnerabilities

Same product: Contact Form 7 – PayPal & Stripe Add-on
Same vendor: scottpaterson
Same weakness: CWE-345

V. Comments for CVE-2026-9189

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