# Membership Plugin – Kadence Memberships <= 4.0.5 - Authenticated (Subscriber+) Membership Level Manipulation via Renewal Registration

- **ID:** WPSEC-2026-2992
- **Plugin:** Membership Plugin – Kadence Memberships (`restrict-content`), https://wordpress.org/plugins/restrict-content/
- **Affected versions:** from 3.0 before 4.0.6
- **Fixed in:** 4.0.6 (Update to 4.0.6 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-840
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-11-12)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/restrict-content
- **Fix released:** 2026-11-11
- **Published:** 2026-11-12
- **URL:** https://wpsec.com/vuln/WPSEC-2026-2992/

## Description

The Membership Plugin – Kadence Memberships plugin for WordPress is vulnerable to business logic abuse via the renewal registration process in rcp_process_registration in all versions up to, and including, 4.0.5, due to missing validation that the membership level submitted with a renewal matches the level of the membership being renewed. This makes it possible for authenticated attackers, with subscriber-level access and above and an existing membership, to renew that membership at the price of a different, cheaper or inactive membership level, without the signup fee.

## References

- https://wpsec.com/vuln/WPSEC-2026-2992/
- https://plugins.svn.wordpress.org/restrict-content/tags/4.0.6/
- https://wordpress.org/plugins/restrict-content/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-2992/

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.