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CVE-2026-3895: WPBakery Page Builder Addons by Livemesh <= 3.9.4 - Missing Authorization to Authenticated (Subscriber+) Stored Cross-Site Scripting

• 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 WPBakery Page Builder Addons by Livemesh plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `lvca_admin_ajax` AJAX action in all versions up to, and including, 3.9.4 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 WPBakery Page Builder Addons by Livemesh: through 3.9.4

References

• https://plugins.trac.wordpress.org/browser/addons-for-visual-composer/tags/3.9.4/admin/admin-ajax.php#L64
• https://plugins.trac.wordpress.org/browser/addons-for-visual-composer/tags/3.9.4/admin/views/settings.php#L568
• https://plugins.trac.wordpress.org/browser/addons-for-visual-composer/tags/3.9.4/includes/helper-functions.php#L256
• https://www.wordfence.com/threat-intel/vulnerabilities/id/ff0d4000-020b-4e22-9362-a8f0f5df321e?source=cve

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