# CVE-2026-88764

## Summary

- **CVE ID:** CVE-2026-88764
- **Severity:** MEDIUM
- **CVSS Score:** 5.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N)
- **CWE:** N/A
- **Published:** Sep 13, 2026
- **Last Modified:** Sep 13, 2026

## Description

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.

## Affected Products

- Unknown — Simple Membership (0)

## References

- [CNA](https://wpscan.com/vulnerability/54fdf46e-0385-40a3-b3bc-a862dc0fb03e/)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.14%
- **EPSS Percentile:** 3.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._