CVE-2026-88764 — Simple Membership < 4.7.8 - Subscriber+ Membership Level Escalation via PayPal Standard subsc_ref
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 pa…
Published: 2026-09-13 · CVSS: 5.4 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7