---
id: CVE-2026-88764
title: >-
  The Simple Membership WordPress plugin before 4.7.8 does not validate that the
  membership level supplied in a PayPal payment notification matches the level
  configured for the paid payment button, allowing members to pay for a
  lower-price…
summary: >-
  The Simple Membership WordPress plugin before 4.7.8 does not validate that the
  membership level supplied in a PayPal payment notification matches the level
  configured for the paid payment button, allowing members to pay for a
  lower-price…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-269
product: Simple Membership
affected:
  - simple_membership < 4.7.8
published: '2026-09-13'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T21:10:17.423'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88764'
references:
  - url: 'https://wpscan.com/vulnerability/54fdf46e-0385-40a3-b3bc-a862dc0fb03e/'
    label: contact@wpscan.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-13T10:42:12.856460Z'
ingestedAt: '2026-09-14T15:23:07.471Z'
epss: 0.0023
epssPercentile: 0.12311
---

## Overview

The Simple Membership WordPress plugin before 4.7.8 does not validate that the membership level supplied in a PayPal payment notification matches the level configured for the paid payment button, allowing members to pay for a lower-priced membership while being granted a higher, more privileged membership level.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.