CVE-2026-6675— Responsive Blocks <= 2.2.0 - Unauthenticated Open Email Relay via REST API 'email_to' Parameter
Quick assessment
Affected
cyberchimps Responsive Blocks – Page Builder for Blocks & Patterns
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 Responsive Blocks – Page Builder for Blocks & Patterns 2.2.0及之前版本存在输入验证错误漏洞，该漏洞源于授权检查不足以及通过公共REST API路由提供的收件
Possible ATT&CK Techniques 1 AI
T1537 · Transfer Data to Cloud Account
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I. Basic Information for CVE-2026-6675
Vulnerability Information
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Vulnerability Title
Responsive Blocks <= 2.2.0 - Unauthenticated Open Email Relay via REST API 'email_to' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The Responsive Blocks – Page Builder for Blocks & Patterns plugin for WordPress is vulnerable to Unauthenticated Open Email Relay in all versions up to, and including, 2.2.0. This is due to insufficient authorization checks and missing server-side validation of the recipient email address supplied via a public REST API route. This makes it possible for unauthenticated attackers to send arbitrary emails to any recipient of their choosing through the affected WordPress site's mail server, effectively turning the site into an open mail relay.
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 Responsive Blocks – Page Builder for Blocks & Patterns 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 Responsive Blocks – Page Builder for Blocks & Patterns 2.2.0及之前版本存在输入验证错误漏洞，该漏洞源于授权检查不足以及通过公共REST API路由提供的收件
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 |
|---|---|---|---|---|
| cyberchimps | Responsive Blocks – Page Builder for Blocks & Patterns | 0 ~ 2.2.0 | - |
|
II. Public POCs for CVE-2026-6675
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same vendor: cyberchimps
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V. Comments for CVE-2026-6675
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