EUVD-2026-41310
GHSA-vq29-gpgr-jh2f
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
Contributor account required (PR:L), victim interaction needed (UI:R), scope changes to victim browser (S:C); no availability impact from XSS alone.
Primary rating from Vendor (Patchstack).
CVSS VectorVendor: Patchstack
Lifecycle Timeline
1DescriptionCVE.org
Contributor Cross Site Scripting (XSS) in Livemesh Addons for WPBakery Page Builder <= 3.9.4 versions.
AnalysisAI
Stored Cross-Site Scripting in Livemesh Addons for WPBakery Page Builder versions 3.9.4 and earlier allows authenticated Contributors to inject persistent malicious scripts into WordPress pages. When a higher-privileged user such as an Editor or Administrator views the affected content, the injected script executes in their browser session - enabling session hijacking, credential theft, or privilege escalation within the WordPress admin panel. No public exploit or CISA KEV listing has been identified at time of analysis, but the low-privilege entry point and Changed scope elevate real-world risk for multi-author WordPress installations.
Technical ContextAI
The affected product is a WordPress plugin that extends WPBakery Page Builder (formerly Visual Composer) with additional shortcodes and widgets, identified by CPE cpe:2.3:a:livemesh:livemesh_addons_for_wpbakery_page_builder:*:*:*:*:*:*:*:*. The root cause is CWE-79 (Improper Neutralization of Input During Web Page Generation), meaning the plugin fails to adequately sanitize or escape user-supplied input before rendering it in page output. In WordPress's role-based access model, Contributors can create and submit content but cannot publish it unreviewed - however, if the XSS payload is stored in a page builder widget or shortcode field and later rendered when an admin reviews or previews the content, the injected script executes under the victim's authenticated browser session. The Changed scope (S:C in the CVSS vector) reflects this cross-user impact: the attacker's payload executes in a different security principal's context than the one used to inject it.
RemediationAI
Patch available per vendor advisory - update Livemesh Addons for WPBakery Page Builder to a version beyond 3.9.4 as detailed in the Patchstack advisory at https://patchstack.com/database/wordpress/plugin/addons-for-visual-composer/vulnerability/wordpress-livemesh-addons-for-wpbakery-page-builder-plugin-3-9-4-cross-site-scripting-xss-vulnerability-2. The exact patched release version is not independently confirmed from the available input data; verify the fix version directly from the WordPress plugin repository or vendor changelog before deploying. If an immediate upgrade is not possible, restrict the Contributor role so that untrusted users cannot create or edit content that passes through the vulnerable plugin's shortcodes or widgets - this can be done via role management plugins but may reduce site functionality. A Web Application Firewall (WAF) rule targeting stored XSS payloads in page builder fields provides partial defense but should not be treated as a full substitute for patching.
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External POC / Exploit Code
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