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

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Summary

CVECVE-2026-1321
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-05 08:15:57 UTC
Updated2026-04-22 21:27:27 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001330000 probability, percentile 0.329490000 (date 2026-04-22)

Problem Types: CWE-862 | CWE-862 CWE-862 Missing Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Stellarwp Membership Plugin Restrict Content affected 3.2.20 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/restrict-content/tags/3.2.15/core/includes/class-rcp-... [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/abfaa4a6-92b0-4233-b08d-e6680... [email protected] www.wordfence.com
plugins.trac.wordpress.org/changeset/3460177 [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/restrict-content/tags/3.2.15/core/includes/membership... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/restrict-content/tags/3.2.15/core/includes/registrati... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/changeset/3447187 [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/restrict-content/tags/3.2.15/core/includes/registrati... [email protected] plugins.trac.wordpress.org
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Vendor Comments And Credit

Discovery Credit

CNA: Angus Girvan (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-01-22T01:37:00.000ZVendor Notified
CNA2026-03-04T00:00:00.000ZDisclosed
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