CVE-2026-24594 in Addons for WPBakery Page Builder Plugin
Summary
by MITRE • 01/23/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in livemesh Livemesh Addons for WPBakery Page Builder addons-for-visual-composer allows Stored XSS.This issue affects Livemesh Addons for WPBakery Page Builder: from n/a through <= 3.9.4.
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Analysis
by VulDB Data Team • 01/23/2026
This vulnerability represents a critical cross-site scripting flaw in the livemesh addons-for-visual-composer plugin for WPBakery Page Builder, classified under CWE-79 as improper neutralization of input during web page generation. The flaw enables stored cross-site scripting attacks where malicious scripts can be injected into the application's output and subsequently executed in the context of other users' browsers. The vulnerability specifically impacts versions of the Livemesh Addons plugin ranging from the initial release through version 3.9.4, creating a substantial attack surface for potential exploitation. The stored nature of this XSS vulnerability means that malicious input is permanently stored on the server and then served to other users without proper sanitization or encoding.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding within the plugin's web page generation processes. When administrators or users input data through the plugin's interface, the application fails to properly sanitize or encode special characters that could be interpreted as executable script code. This allows attackers to inject malicious javascript payloads through form fields, content editors, or other input mechanisms within the plugin's administrative interface. The vulnerability occurs during the rendering process when user-supplied data is directly incorporated into HTML output without appropriate context-aware encoding, creating opportunities for attackers to execute arbitrary code in the browsers of unsuspecting victims.
The operational impact of this vulnerability extends beyond simple data theft or defacement, as it can enable sophisticated attack chains that compromise entire user sessions and potentially lead to full system compromise. An attacker who successfully exploits this vulnerability could steal session cookies, redirect users to malicious sites, modify content displayed on the website, or even escalate privileges within the WordPress environment. The stored nature of the vulnerability means that the malicious payload persists even after the initial injection, making it particularly dangerous as it can affect multiple users over extended periods. This vulnerability directly aligns with ATT&CK technique T1566.001 for initial access through malicious content and T1059.001 for command and control through script-based payloads, creating a comprehensive attack vector that can be leveraged for persistent threats.
Mitigation strategies for this vulnerability should focus on immediate patching of the affected plugin to version 3.9.5 or later, which contains the necessary input sanitization and output encoding fixes. Administrators should also implement comprehensive input validation at multiple layers including application-level filtering, content security policies to prevent script execution, and regular security scanning of plugin files to detect unauthorized modifications. Additionally, implementing proper privilege separation where administrative functions are restricted to trusted users only can limit the potential impact of exploitation. Network-level protections such as web application firewalls should be configured to monitor for common XSS attack patterns, while regular security audits of WordPress installations should include verification of plugin integrity and proper output encoding practices. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date plugins and implementing defense-in-depth strategies to protect against persistent threats in web application environments.