# Extensive VC Addons for WPBakery page builder <= 1.8.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'title_tag' and 'text_tag' Shortcode Attributes

- **ID:** WPSEC-2026-1591
- **Plugin:** Extensive VC Addons for WPBakery page builder (`extensive-vc-addon`), https://wordpress.org/plugins/extensive-vc-addon/
- **Affected versions:** all versions before 2.0
- **Fixed in:** 2.0 (Update to 2.0 or later.)
- **Severity:** Medium 6.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N)
- **Weakness:** CWE-79
- **Usage among sites WPSec scans:** plugin Medium, affected versions Medium (as of 2026-10-25)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/extensive-vc-addon
- **Fix released:** 2026-10-23
- **Published:** 2026-10-24
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1591/

## Description

The Extensive VC Addons for WPBakery page builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'title_tag' and 'text_tag' attributes of the plugin's shortcodes in all versions up to, and including, 1.8.1. This is due to the user-supplied tag value being printed as an HTML tag name without validation against a list of allowed tags, and esc_attr() not preventing additional attributes from being injected into the tag. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

## References

- https://wpsec.com/vuln/WPSEC-2026-1591/
- https://plugins.svn.wordpress.org/extensive-vc-addon/tags/2.0/
- https://wordpress.org/plugins/extensive-vc-addon/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1591/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.