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CVE-2026-4658— Gutenberg Essential Blocks <= 6.0.4 - Authenticated (Contributor+) Stored Cross-Site Scripting via Block Attributes

Quick assessment

Affected
wpdevteam Gutenberg Essential Blocks – Page Builder for Gutenberg 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 Essential Blocks 6.0.4及之前版本存在跨站脚本漏洞，该漏洞源于在render_callback()函数中对className、classHook和blockId属性输出转义不足，可能导致经过身份验

CVSS 6.4 · Medium EPSS 0.42% · P34

Affected Version Matrix 1

VendorProduct Version RangeStatus
wpdevteam Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns ≤ 6.0.4 affected
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I. Basic Information for CVE-2026-4658

Vulnerability Information
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Vulnerability Title
Gutenberg Essential Blocks <= 6.0.4 - Authenticated (Contributor+) Stored Cross-Site Scripting via Block Attributes
Source: CVE Program / CVE List V5
Vulnerability Description
The Essential Blocks – Page Builder Gutenberg Blocks, Patterns & Templates plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the className, classHook, and blockId attributes in the Add to Cart block (essential-blocks/add-to-cart) in all versions up to, and including, 6.0.4. This is due to insufficient output escaping in the render_callback() function where these attributes are placed into class and data-id HTML attributes using raw sprintf() and implode() without esc_attr() escaping. While the outer wrapper div uses get_block_wrapper_attributes() which properly escapes, the inner divs do not. 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.
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 plugin Essential Blocks 跨站脚本漏洞
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 Essential Blocks 6.0.4及之前版本存在跨站脚本漏洞，该漏洞源于在render_callback()函数中对className、classHook和blockId属性输出转义不足，可能导致经过身份验
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
wpdevteam Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns 0 ~ 6.0.4 -

II. Public POCs for CVE-2026-4658

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III. Intelligence Information for CVE-2026-4658

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Vendor Advisories for CVE-2026-4658 (1)

IV. Related Vulnerabilities

Same product: Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns
Same vendor: wpdevteam
Same weakness: CWE-79

V. Comments for CVE-2026-4658

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