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CVE-2026-18100— MetForm <= 4.1.8 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'mf_form_id' Widget Setting

Quick assessment

Affected
roxnor MetForm – Contact Form, Survey, Quiz, Conditional Forms, Form Templates & Custom Form Builder for Elementor
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 MetForm是WordPress基金会的一款表单创建与提交管理插件。 WordPress MetForm 4.1.8及之前版本存在跨站脚本漏洞，该漏洞源于对'mf_form_id' Widget Setting参数输入清理和输出转义不足，可能导致经过身份验证的攻击者（具有贡献者级别及以上权限）注入任意Web脚本，形成存储型跨站脚本攻击，在用户访问被注入页面时执行。

CVSS 6.4 · Medium EPSS 0.29% · P20

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
roxnor MetForm – Contact Form, Survey, Quiz, Conditional Forms, Form Templates & Custom Form Builder for Elementor ≤ 4.1.8 affected
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I. Basic Information for CVE-2026-18100

Vulnerability Information
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Vulnerability Title
MetForm <= 4.1.8 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'mf_form_id' Widget Setting
Source: CVE Program / CVE List V5
Vulnerability Description
The MetForm – Contact Form, Survey, Quiz, & Custom Form Builder for Elementor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'mf_form_id' Widget Setting in all versions up to, and including, 4.1.8 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The payload bypasses Elementor's save-time wp_kses_post filter because it contains no HTML tags, and MetForm's own str_replace transformation of script tags into JavaScript template literal expressions provides an additional delivery path.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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 MetForm 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress MetForm是WordPress基金会的一款表单创建与提交管理插件。 WordPress MetForm 4.1.8及之前版本存在跨站脚本漏洞，该漏洞源于对'mf_form_id' Widget Setting参数输入清理和输出转义不足，可能导致经过身份验证的攻击者（具有贡献者级别及以上权限）注入任意Web脚本，形成存储型跨站脚本攻击，在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
roxnor MetForm – Contact Form, Survey, Quiz, Conditional Forms, Form Templates & Custom Form Builder for Elementor 0 ~ 4.1.8 -

II. Public POCs for CVE-2026-18100

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III. Intelligence Information for CVE-2026-18100

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Patches & Fixes for CVE-2026-18100 (4)

Vendor Advisories for CVE-2026-18100 (1)

News Coverage for CVE-2026-18100 (1)

Same Patch Batch · roxnor · 2026-08-25 · 4 CVEs total

CVE-2026-75971 7.2 HIGH ShopEngine Elementor WooCommerce Builder Addon <= 4.9.4 - Authenticated (Shop Manager+) Pr
CVE-2026-76063 6.4 MEDIUM FundEngine <= 1.8.1 - Authenticated (Subscriber+) Stored Cross-Site Scripting via 'wfp_fea
CVE-2026-75930 4.3 MEDIUM FundEngine <= 1.8.1 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Post

IV. Related Vulnerabilities

Same vendor: roxnor
Same weakness: CWE-79

V. Comments for CVE-2026-18100

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