What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-27 · updated 2026-06-17
• Weakness: CWE-862

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.

Affected products

• Livemesh Addons for Beaver Builder: through 3.9.2

References

• https://plugins.trac.wordpress.org/browser/addons-for-beaver-builder/tags/3.9.2/admin/admin-ajax.php#L64
• https://plugins.trac.wordpress.org/browser/addons-for-beaver-builder/tags/3.9.2/admin/views/settings.php#L137
• https://plugins.trac.wordpress.org/browser/addons-for-beaver-builder/tags/3.9.2/includes/helper-functions.php#L248
• https://www.wordfence.com/threat-intel/vulnerabilities/id/8bc41c61-1d8a-445f-bd70-3b14a40c89d4?source=cve

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