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CVE-2026-3897— Livemesh Addons for Beaver Builder <= 3.9.2 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Missing Authorization

Quick assessment

Affected
livemesh Livemesh Addons for Beaver 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 Livemesh Addons for Beaver Builder 3.9.2及之前版本存在安全漏洞，该漏洞源于授权检查缺失和输入清理不足，可能导致认证攻击者修改插件设置并注入恶意脚本。

CVSS 6.4 · Medium EPSS 0.30% · P21

Affected Version Matrix 1

VendorProduct Version RangeStatus
livemesh Livemesh Addons for Beaver Builder ≤ 3.9.2 affected
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I. Basic Information for CVE-2026-3897

Vulnerability Information
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Vulnerability Title
Livemesh Addons for Beaver Builder <= 3.9.2 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Missing Authorization
Source: CVE Program / CVE List V5
Vulnerability Description
The Livemesh Addons for Beaver Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `labb_admin_ajax` AJAX action in all versions up to, and including, 3.9.2 due to missing authorization checks and insufficient input sanitization. The AJAX handler verifies a nonce but does not check user capabilities. This makes it possible for authenticated attackers with Subscriber-level access and above to modify plugin settings and inject malicious scripts that execute when administrators access the plugin settings page or when any user visits the frontend.
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
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress plugin Livemesh Addons for Beaver Builder 安全漏洞
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 Livemesh Addons for Beaver Builder 3.9.2及之前版本存在安全漏洞，该漏洞源于授权检查缺失和输入清理不足，可能导致认证攻击者修改插件设置并注入恶意脚本。
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
livemesh Livemesh Addons for Beaver Builder 0 ~ 3.9.2 -

II. Public POCs for CVE-2026-3897

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III. Intelligence Information for CVE-2026-3897

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Patches & Fixes for CVE-2026-3897 (1)

Other References for CVE-2026-3897 (1)

Same Patch Batch · livemesh · 2026-05-27 · 4 CVEs total

CVE-2026-3895 6.4 MEDIUM WPBakery Page Builder Addons by Livemesh <= 3.9.4 - Missing Authorization to Authenticated
CVE-2026-3896 6.4 MEDIUM Livemesh SiteOrigin Widgets <= 3.9.2 - Missing Authorization to Authenticated (Subscriber+
CVE-2026-2030 6.4 MEDIUM WPBakery Page Builder Addons by Livemesh <= 3.9.4 - Authenticated (Contributor+) Stored Cr

IV. Related Vulnerabilities

Same product: Livemesh Addons for Beaver Builder
Same vendor: livemesh
Same weakness: CWE-862

V. Comments for CVE-2026-3897

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