# TI WooCommerce Wishlist <= 2.12.1 - Unauthenticated Authorization Bypass to Guest Wishlist Takeover via 'tinv_wishlistkey' Cookie

- **ID:** WPSEC-2026-0856
- **Plugin:** TI WooCommerce Wishlist (`ti-woocommerce-wishlist`), https://wordpress.org/plugins/ti-woocommerce-wishlist/
- **Affected versions:** all versions before 2.13.0
- **Fixed in:** 2.13.0 (Update to 2.13.0 or later.)
- **Severity:** Medium 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N)
- **Weakness:** CWE-639
- **Usage among sites WPSec scans:** plugin Medium, affected versions Medium (as of 2026-10-13)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/ti-woocommerce-wishlist
- **Fix released:** 2026-10-12
- **Published:** 2026-10-13
- **URL:** https://wpsec.com/vuln/WPSEC-2026-0856/

## Description

The TI WooCommerce Wishlist plugin for WordPress is vulnerable to Authorization Bypass via the 'tinv_wishlistkey' cookie in all versions up to, and including, 2.12.1, due to guest wishlist ownership being decided only by comparing the client-supplied cookie value with the wishlist's share key. That key appears in the wishlist's share links and is a short, predictable six-character value. This makes it possible for unauthenticated attackers who know or guess a guest wishlist's share key to act as its owner: they can view the list even when it is private, remove its items through the wishlist AJAX actions, and move the list into their own account when they log in.

## References

- https://wpsec.com/vuln/WPSEC-2026-0856/
- https://plugins.svn.wordpress.org/ti-woocommerce-wishlist/tags/2.13.0/
- https://wordpress.org/plugins/ti-woocommerce-wishlist/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-0856/

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.