CVE-2026-1321 json
Membership Plugin – Restrict Content <= 3.2.20 - Unauthenticated Privilege Escalation via 'rcp_level'
published 2026-03-05 8 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-9796
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 35%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- liquidweb restrict_content 3.2.21
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 8 mo ago
Exploit prediction
0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
- stellarwp Membership Plugin – Restrict Content
Classification
- Weakness
-
- CWE-862 Missing Authorization
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/abfaa4a6-92b0-4233-b08d-e668090d3fc2?source=cve
- plugins.trac.wordpress.org /browser/restrict-content/tags/3.2.15/core/includes/registration-functions.php#L1191
- plugins.trac.wordpress.org /browser/restrict-content/tags/3.2.15/core/includes/registration-functions.php#L1203
- plugins.trac.wordpress.org /browser/restrict-content/tags/3.2.15/core/includes/class-rcp-registration.php#L107
- plugins.trac.wordpress.org /browser/restrict-content/tags/3.2.15/core/includes/memberships/class-rcp-membership.php#L1939
- plugins.trac.wordpress.org /changeset/3447187/
- plugins.trac.wordpress.org /changeset/3460177/
Sources
- CVE List CVE-2026-1321
- NVD CVE-2026-1321
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.