Vulnerability · Published Sep 13, 2026 · Assigned by WPScan
CVE-2026-88764Simple Membership < 4.7.8 - Subscriber+ Membership Level Escalation via PayPal Standard subsc_ref
Medium 5.4
In plain English
A medium-severity privilege mismanagement in Simple Membership from Unknown. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities).
Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.2%top 86.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Unknown | Simple Membership | 0 – before 4.7.8 |
Weakness: CWE-269 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
References
- https://wpscan.com/vulnerability/54fdf46e-0385-40a3-b3bc-a862dc0fb03e/ exploit, vdb-entry, technical-description