# Gutenberg WooCommerce Builder Blocks for ShopEngine, Variation Swatches, Wishlist, Products Compare <= 2.4.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'font_link' Parameter

- **ID:** WPSEC-2026-2259
- **Plugin:** ShopEngine Gutenberg WooCommerce Builder Blocks Addon – All in One WooCommerce Solution (`blocks-for-shopengine`), https://wordpress.org/plugins/blocks-for-shopengine/
- **Affected versions:** all versions before 2.4.4
- **Fixed in:** 2.4.4 (Update to 2.4.4 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 Low, affected versions Low (as of 2026-11-03)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/blocks-for-shopengine
- **Fix released:** 2026-11-02
- **Published:** 2026-11-03
- **URL:** https://wpsec.com/vuln/WPSEC-2026-2259/

## Description

The ShopEngine Gutenberg WooCommerce Builder Blocks Addon plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'font_link' parameter of the gutenova_store_css AJAX action in all versions up to, and including, 2.4.3 due to insufficient output escaping when the stored gutenova_font_link post meta is placed inside a double-quoted JavaScript string in the block editor's inline script. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts that execute whenever a user, such as an administrator, opens the affected post in the block editor.

## References

- https://wpsec.com/vuln/WPSEC-2026-2259/
- https://plugins.svn.wordpress.org/blocks-for-shopengine/tags/2.4.4/
- https://wordpress.org/plugins/blocks-for-shopengine/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-2259/

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.