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CVE-2026-18328— Forminator Forms <= 1.57.0 - Unauthenticated DOM-Based Cross-Site Scripting via 'error_description' Parameter

Quick assessment

Affected
wpmudev Forminator Forms – Contact Form, Payment Form & Custom Form Builder
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 Forminator Forms是WordPress基金会开源的一款表单构建插件。 WordPress Forminator Forms 1.57.0及之前版本存在跨站脚本漏洞，该漏洞源于通过'error_description'参数输入清理和输出转义不足，可能导致基于DOM的反射型跨站脚本攻击，未经身份验证的攻击者可在页面中注入任意Web脚本，当用户访问被注入页面时执行。

CVSS 7.2 · High EPSS 0.35% · P26

Affected Version Matrix 1

VendorProduct Version RangeStatus
wpmudev Forminator Forms – Contact Form, Payment Form & Custom Form Builder ≤ 1.57.0 affected
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I. Basic Information for CVE-2026-18328

Vulnerability Information
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Vulnerability Title
Forminator Forms <= 1.57.0 - Unauthenticated DOM-Based Cross-Site Scripting via 'error_description' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The Forminator Forms – Contact Form, Payment Form & Custom Form Builder plugin for WordPress is vulnerable to DOM-Based Reflected Cross-Site Scripting via the 'error_description' parameter in all versions up to, and including, 1.57.0 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The vulnerability is only triggerable on pages hosting a Forminator form configured to use the Stripe Checkout Sessions payment API, which became the default in 1.56.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress Forminator Forms 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Forminator Forms是WordPress基金会开源的一款表单构建插件。 WordPress Forminator Forms 1.57.0及之前版本存在跨站脚本漏洞，该漏洞源于通过'error_description'参数输入清理和输出转义不足，可能导致基于DOM的反射型跨站脚本攻击，未经身份验证的攻击者可在页面中注入任意Web脚本，当用户访问被注入页面时执行。
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
wpmudev Forminator Forms – Contact Form, Payment Form & Custom Form Builder 0 ~ 1.57.0 -

II. Public POCs for CVE-2026-18328

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III. Intelligence Information for CVE-2026-18328

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Patches & Fixes for CVE-2026-18328 (1)

Vendor Advisories for CVE-2026-18328 (1)

IV. Related Vulnerabilities

Same product: Forminator Forms – Contact Form, Payment Form & Custom Form Builder
Same vendor: wpmudev
Same weakness: CWE-79

V. Comments for CVE-2026-18328

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