CVE-2026-86406: CWE-269 Improper Privilege Management in User Registration & Membership
The User Registration & Membership WordPress plugin before 5.2.8 does not check the capability of the user making a membership purchase, and does not validate the payment method or the plan submitted with it, allowing any authenticated user such as a subscriber to be granted the WordPress role attached to a paid plan without paying for it. Where the site owner has mapped a plan to a privileged role, this leads to privilege escalation up to administrator.
AI Analysis
Technical Summary
CVE-2026-86406 describes an improper privilege management vulnerability (CWE-269) in the User Registration & Membership WordPress plugin before version 5.2.8. The flaw arises because the plugin does not check the user's capability when processing membership purchases and does not validate the payment method or plan submitted. Consequently, authenticated users can be granted roles associated with paid plans without completing payment. This can escalate privileges up to administrator if the site owner has mapped paid plans to high-privilege roles.
Potential Impact
An attacker with an authenticated subscriber-level account can exploit this vulnerability to gain elevated privileges, potentially up to administrator level. This compromises the confidentiality, integrity, and availability of the affected WordPress site, allowing full control over site content, settings, and user management.
Mitigation Recommendations
Upgrade the User Registration & Membership plugin to version 5.2.8 or later, where this vulnerability is fixed. No other mitigation is indicated. Patch status is confirmed by the version range affected and the fixed version 5.2.8.
CVE-2026-86406: CWE-269 Improper Privilege Management in User Registration & Membership
Description
The User Registration & Membership WordPress plugin before 5.2.8 does not check the capability of the user making a membership purchase, and does not validate the payment method or the plan submitted with it, allowing any authenticated user such as a subscriber to be granted the WordPress role attached to a paid plan without paying for it. Where the site owner has mapped a plan to a privileged role, this leads to privilege escalation up to administrator.
CVSS v3.1
Score 7.5high
Affected software
User Registration & Membership
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-86406 describes an improper privilege management vulnerability (CWE-269) in the User Registration & Membership WordPress plugin before version 5.2.8. The flaw arises because the plugin does not check the user's capability when processing membership purchases and does not validate the payment method or plan submitted. Consequently, authenticated users can be granted roles associated with paid plans without completing payment. This can escalate privileges up to administrator if the site owner has mapped paid plans to high-privilege roles.
Potential Impact
An attacker with an authenticated subscriber-level account can exploit this vulnerability to gain elevated privileges, potentially up to administrator level. This compromises the confidentiality, integrity, and availability of the affected WordPress site, allowing full control over site content, settings, and user management.
Mitigation Recommendations
Upgrade the User Registration & Membership plugin to version 5.2.8 or later, where this vulnerability is fixed. No other mitigation is indicated. Patch status is confirmed by the version range affected and the fixed version 5.2.8.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-09-07T12:04:24.688Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aa682ae55bf5e2cf583e195
Added to database: 09/13/2026, 11:02:06 UTC
Last enriched: 09/13/2026, 11:16:31 UTC
Last updated: 09/14/2026, 03:01:23 UTC
Views: 14
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