How serious is CVE-2026-1321?

This vulnerability has a CVSS score of 8.1 out of 10, classified as HIGH severity. Proof-of-concept exploit code is publicly available, making this an active threat.

Is there exploit code available for CVE-2026-1321?

Yes, proof-of-concept exploit code for CVE-2026-1321 is publicly available on GitHub and security research platforms. This increases the risk of active exploitation.

Which products are affected by CVE-2026-1321?

Check the official CVE details for a complete list of affected products and versions.

How do I fix CVE-2026-1321?

To remediate CVE-2026-1321, check for security patches from the vendor. Apply all available updates and security patches. If no patch is available, implement recommended workarounds or security controls to mitigate the risk.

CVE-2026-1321

High

|8.1

Exploit Available

Plain English Summary

AI-powered analysis for quick understanding

This vulnerability allows attackers to register for any membership level on a WordPress site, including those that should be inactive or require payment, potentially giving them high-level access like Administrator privileges. The attacker does not need to be logged in, making it easy for them to exploit this flaw if the site is using an affected version of the Membership Plugin.

Technical 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.

CVSS Vector Analysis

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

Confidentiality ImpactHigh

Integrity ImpactHigh

Availability ImpactHigh

ScopeUnchanged

Vector String

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

Exploit Resources

Search for proof-of-concept code and exploit modules

GitHub Search Exploit-DB Nuclei Templates Metasploit Vulners

Official References

NIST NVD

Est. Bounty

$3,316($1K-$5K)

Vendor Response

Grade APatched in 0 days

Quick Information

Published

Mar 5, 2026

about 1 month ago

Last Modified

Mar 5, 2026

about 1 month ago