Membership Plugin – Restrict Content <= 3.2.20 - Unauthenticated Privilege Escalation via 'rcp_level'

Missing Authorization
CVE CVE-2026-1321
CVSS High (8.1)
Publicly Published March 4, 2026
Last Updated March 5, 2026
Researcher shark3y
Description

The Membership Plugin – Restrict Content plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 3.2.20. This is due to the `rcp_setup_registration_init()` function accepting any membership level ID via the `rcp_level` POST parameter without validating that the level is active or that payment is required. Combined with the `add_user_role()` method which assigns the WordPress role configured on the membership level without status checks, this makes it possible for unauthenticated attackers to register with any membership level, including inactive levels that grant privileged WordPress roles such as Administrator, or paid levels that charge a sign-up fee. The vulnerability was partially patched in version 3.2.18.

References

1 affected software package

Software Type Plugin
Software Slug restrict-content (view on wordpress.org)
Patched? Yes
Affected Version
  • <= 3.2.20
Patched Version
  • 3.2.21
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