# SellKit – Funnel builder and checkout optimizer for WooCommerce to sell more, faster <= 2.8.0 - Missing Authorization to Authenticated (Subscriber+) WooCommerce Plugin Installation and Activation

- **ID:** WPSEC-2026-2035
- **Plugin:** SellKit – Funnel builder and checkout optimizer for WooCommerce to sell more, faster (`sellkit`), https://wordpress.org/plugins/sellkit/
- **Affected versions:** all versions before 2.8.1
- **Fixed in:** 2.8.1 (Update to 2.8.1 or later.)
- **Severity:** Medium 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N)
- **Weakness:** CWE-862
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-10-30)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/sellkit
- **Fix released:** 2026-10-29
- **Published:** 2026-10-30
- **URL:** https://wpsec.com/vuln/WPSEC-2026-2035/

## Description

The SellKit plugin for WordPress is vulnerable to unauthorized plugin installation and activation via the 'sellkit_install_woocommerce_plugin_by_notice' AJAX action in all versions up to, and including, 2.8.0. This is due to a missing capability check on the installer() function, which verifies only the 'sellkit_admin' nonce. That nonce is printed on every wp-admin page for any logged-in user. This makes it possible for authenticated attackers, with Subscriber-level access and above, to install and activate the WooCommerce plugin on the site.

## References

- https://wpsec.com/vuln/WPSEC-2026-2035/
- https://plugins.svn.wordpress.org/sellkit/tags/2.8.1/
- https://wordpress.org/plugins/sellkit/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-2035/

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.