# YITH WooCommerce Compare <= 3.15.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'text' Shortcode Attribute

- **ID:** WPSEC-2026-0954
- **Plugin:** YITH WooCommerce Compare (`yith-woocommerce-compare`), https://wordpress.org/plugins/yith-woocommerce-compare/
- **Affected versions:** all versions before 3.15.1
- **Fixed in:** 3.15.1 (Update to 3.15.1 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 2026-10-14)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/yith-woocommerce-compare
- **Fix released:** 2026-10-13
- **Published:** 2026-10-14
- **URL:** https://wpsec.com/vuln/WPSEC-2026-0954/

## Description

The YITH WooCommerce Compare plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'text' attribute of the [yith_woocompare_counter] shortcode in all versions up to, and including, 3.15.0. This is due to insufficient input sanitization and output escaping. The attribute is only passed through sanitize_text_field(), which leaves HTML-entity-encoded markup in place. The value is then printed into the counter's data-text_o attribute with esc_attr(), which does not encode existing entities a second time. On page load, the front-end counter script writes the decoded value into the page with jQuery's .html(). 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-2026-0954/
- https://plugins.svn.wordpress.org/yith-woocommerce-compare/tags/3.15.1/
- https://wordpress.org/plugins/yith-woocommerce-compare/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-0954/

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.