CVE-2026-1321
HIGHCVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2Description
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.
Analysis
Unauthenticated attackers can escalate privileges in WordPress installations using the Membership Plugin - Restrict Content (versions up to 3.2.20) by registering with arbitrary membership levels, including inactive levels or those granting administrator access, due to insufficient validation of the rcp_level parameter. This allows attackers to bypass payment requirements and gain unauthorized administrative roles without authentication. …
Sign in for full analysis, threat intelligence, and remediation guidance.
Remediation
Within 24 hours: Audit all WordPress installations for the Membership Plugin and document affected systems; consider taking the plugin offline if business operations allow. Within 7 days: Implement Web Application Firewall (WAF) rules to block exploitation attempts and restrict plugin functionality to trusted IP ranges only; evaluate alternative membership plugins. …
Sign in for detailed remediation steps.
Priority Score
Share
External POC / Exploit Code
Leaving vuln.today