CVE-2026-15931: Unknown Simple Membership

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

The Simple Membership WordPress plugin before 4.7.8 does not sanitise a subscriber name value received from an unauthenticated payment approval request, nor escape it when displaying it in the administration dashboard, allowing unauthenticated attackers to store arbitrary JavaScript that executes in an administrator's session.

Affected products

• Unknown Simple Membership: before 4.7.8 (fixed in 4.7.8)

Published 2026-08-03. Last modified 2026-08-26.