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CVE-2026-6394— Nexa Blocks <= 1.1.1 - Unauthenticated Blind Server-Side Request Forgery via 'demo_json_file' Parameter

Quick assessment

Affected
wpdive Nexa Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE
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 Nexa Blocks 1.1.1及之前版本存在代码问题漏洞，该漏洞源于import_demo函数接受用户提供的URL且未进行验证，可能导致未经身份验证的攻击者发起服务端请求伪造攻击，暴露内部服务、云元数据端点和本地

CVSS 5.4 · Medium EPSS 0.32% · P24

Affected Version Matrix 1

VendorProduct Version RangeStatus
wpdive Nexa Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE ≤ 1.1.1 affected
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I. Basic Information for CVE-2026-6394

Vulnerability Information
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Vulnerability Title
Nexa Blocks <= 1.1.1 - Unauthenticated Blind Server-Side Request Forgery via 'demo_json_file' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The Nexa Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE plugin for WordPress is vulnerable to Server-Side Request Forgery (SSRF) in versions up to and including 1.1.1. This is due to the import_demo() function accepting a user-supplied URL in the demo_json_file POST parameter and passing it directly to wp_remote_get() without any URL validation or restriction against internal or private network destinations. The nexa_blocks_nonce required for the AJAX action is publicly exposed in the HTML source of any frontend page where the plugin is active via wp_localize_script on the enqueue_block_assets hook, effectively making the nonce available to all visitors and bypassing any intended authentication barrier. This makes it possible for unauthenticated attackers to make server-side HTTP requests to arbitrary internal or external destinations, potentially exposing internal services, cloud metadata endpoints such as the AWS instance metadata service, localhost services, and other resources not intended to be publicly accessible. A secondary SSRF vector also exists whereby image URLs extracted from the attacker-controlled JSON response are subsequently fetched via a second wp_remote_get() call, allowing chained exploitation through a crafted JSON payload.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress plugin Nexa Blocks 代码问题漏洞
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 Nexa Blocks 1.1.1及之前版本存在代码问题漏洞，该漏洞源于import_demo函数接受用户提供的URL且未进行验证，可能导致未经身份验证的攻击者发起服务端请求伪造攻击，暴露内部服务、云元数据端点和本地
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
wpdive Nexa Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE 0 ~ 1.1.1 -

II. Public POCs for CVE-2026-6394

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III. Intelligence Information for CVE-2026-6394

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Patches & Fixes for CVE-2026-6394 (5)

Vendor Advisories for CVE-2026-6394 (1)

IV. Related Vulnerabilities

Same product: Nexa Blocks – Gutenberg Blocks, Page Builder for Gutenberg Editor & FSE
Same vendor: wpdive
Same weakness: CWE-918

V. Comments for CVE-2026-6394

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