# CVE-2026-109870: User Registration & Membership WordPress plugin coupon validation bypass

Source: https://junglewise.ai/threats/cve-2026-109870-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-2026-109870 · Severity: info · Published 2026-11-11

The User Registration & Membership WordPress plugin fails to validate discount coupons before treating fully discounted membership orders as paid. An attacker can bypass payment entirely and gain access to any paid membership role, including administrator, without authentication or payment.

Technologies: [WPEverest User Registration & Membership](https://junglewise.ai/threats/technologies/user-registration-membership). Vendors: [WPEverest](https://junglewise.ai/threats/vendors/wpeverest).

## Quick answers

**Is CVE-2026-109870 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-109870 being exploited in the wild.

**How severe is CVE-2026-109870?** Informational severity, published 11 November 2026.

**Which products and versions are affected?** WPEverest User Registration & Membership 5.2.8 through 5.3.1.

**Is there a fix for CVE-2026-109870?** 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-2026-109870 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-109870?** Check whether you run WPEverest 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 accepts discount coupons without verifying they are valid for the target paid membership plan before marking an order as complete. An unauthenticated attacker can apply an arbitrary coupon to reduce a paid plan's cost to zero and receive the associated WordPress role without payment, leading to privilege escalation. This is a broken authentication and authorization flaw (CWE-269) that affects versions 5.2.8 through 5.3.1.

## Affected products

- WPEverest User Registration & Membership 5.2.8 through 5.3.1

## Timeline

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

## References

- [https://wpscan.com/vulnerability/6cac7dd1-2ae5-4b5b-94c7-a8a4a63ef84b/](https://wpscan.com/vulnerability/6cac7dd1-2ae5-4b5b-94c7-a8a4a63ef84b/)

## Related threats

- [WPEverest User Registration & Membership payment bypass in paid plans](https://junglewise.ai/threats/cve-2026-11965-wpeverest-user-registration-membership-payment-bypass-in-paid)
- [WordPress User Registration & Membership missing authorization in registration](https://junglewise.ai/threats/cve-2026-6145-wordpress-user-registration-membership-missing-authorization-in)