Authentication Bypass in User Registration & Membership Plugin by WordPress
CVE-2026-109870

8.1HIGH

Key Information:

Vendor

WordPress
Status
User Registration & Membership
Vendor
CVE Published:
11 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-109870?

The User Registration & Membership plugin for WordPress prior to version 5.3.2 fails to validate the applicability of discount coupons on paid membership plans. This lack of validation allows unauthenticated users to apply a discount coupon, treating the resulting order as fully paid without valid payment. Consequently, these users obtain the role associated with the paid plan, potentially escalating privileges, including access to administrator capabilities, if the mapped plan confers such roles.

Affected Version(s)

User Registration & Membership 5.2.8 < 5.3.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-109870 - Proof of Concept

References

https://wpscan.com/vulnerability/6cac7dd1-2ae5-4b5b-94c7-...
exploitvdb-entrytechnical-description

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Maciek Komorowski
WPScan
.