# CVE-2026-109873: User Registration & Membership authentication bypass via omitted membership field

Source: https://junglewise.ai/threats/cve-2026-109873-the-user-registration-membership-wordpress-plugin-before-5-3-2  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-11. Updated: 2026-11-11  
License: CC BY 4.0 with a link back

CVE-2026-109873 · Severity: info · Published 2026-11-11

The User Registration & Membership WordPress plugin fails to enforce payment requirements when users submit registration forms without selecting a membership option. This allows attackers to create accounts and log in on payment-gated registration forms without completing payment, effectively bypassing the security model that requires paid memberships before login access.

Vendors: [Wordpress](https://junglewise.ai/threats/vendors/wordpress).

## Quick answers

**Is CVE-2026-109873 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-109873 being exploited in the wild.

**How severe is CVE-2026-109873?** Informational severity, published 11 November 2026.

**Which products and versions are affected?** Wordpress User Registration & Membership before 5.3.2.

**Is there a fix for CVE-2026-109873?** Yes: fixed in 5.3.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-109873 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-109873?** Check whether you run Wordpress User Registration & Membership at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 5.3.2

## Technical details

The plugin contains an authentication bypass vulnerability (CWE-287) in its payment-before-login validation logic. When a registration form submission omits the membership field entirely, the plugin fails to enforce its payment-gating restriction, allowing unauthenticated account creation and immediate login. The vulnerability affects versions before 5.3.2 and is exploitable over the network without authentication or user interaction beyond crafting a registration request.

## Affected products

- WordPress User Registration & Membership before 5.3.2

## Timeline

- 2026-11-09: disclosed
- 2026-11-09: advisory

## References

- [https://wpscan.com/vulnerability/4cce0bb5-eb8e-4452-a6d1-6c408344bc7f/](https://wpscan.com/vulnerability/4cce0bb5-eb8e-4452-a6d1-6c408344bc7f/)

## Related threats

- [User Registration Membership plugin cross-site request forgery](https://junglewise.ai/threats/cve-2026-92978-the-user-registration-membership-free-paid-memberships)