Membership Level Validation Flaw in Simple Membership Plugin by WordPress
CVE-2026-88764
Currently unrated
Key Information:
- Vendor
WordPress
- Status
- Vendor
- CVE Published:
- 13 September 2026
Badges
👾 Exploit Exists🟡 Public PoC
What is CVE-2026-88764?
The Simple Membership plugin for WordPress, prior to version 4.7.8, is susceptible to an improper input validation vulnerability. This issue arises when the plugin fails to verify that the membership level sent in a PayPal payment notification corresponds with the membership level specified for the payment button. As a result, a user could potentially pay for a lower-priced membership yet be granted access to a higher-level membership, potentially compromising security settings and user privileges.
Affected Version(s)
Simple Membership 0 < 4.7.8
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.