# ShopBoost <= 1.8.9 - Unauthenticated IP Spoofing to Rate Limit Bypass via Quick Order Submission

- **ID:** WPSEC-2026-3148
- **Plugin:** ShopBoost – WooCommerce Toolkit (`flexible-minimum-order`), https://wordpress.org/plugins/flexible-minimum-order/
- **Affected versions:** from 1.7.3 before 1.9.0
- **Fixed in:** 1.9.0 (Update to 1.9.0 or later.)
- **Severity:** Medium 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
- **Weakness:** CWE-348
- **Usage among sites WPSec scans:** plugin Low, affected versions None seen (as of 2026-11-14)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/flexible-minimum-order
- **Fix released:** 2026-11-13
- **Published:** 2026-11-14
- **URL:** https://wpsec.com/vuln/WPSEC-2026-3148/

## Description

The ShopBoost plugin for WordPress is vulnerable to IP address spoofing via the Quick Order submission endpoint (flexmior_quick_order_submit) in all versions up to, and including, 1.8.9. This is due to the per-IP submission rate limit being keyed on the client-supplied CF-Connecting-IP and X-Forwarded-For headers, which are trusted ahead of REMOTE_ADDR. This makes it possible for unauthenticated attackers to send a different spoofed header with each request, get a fresh rate-limit bucket every time and flood the store with quick-order submissions and the notification emails they trigger.

## References

- https://wpsec.com/vuln/WPSEC-2026-3148/
- https://plugins.svn.wordpress.org/flexible-minimum-order/tags/1.9.0/
- https://wordpress.org/plugins/flexible-minimum-order/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-3148/

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.