Simply Schedule Appointments is vulnerable to unauthenticated Stored Cross-Site Scripting in all versions up to and including 1.6.12.2. The root cause is a sanitization-ordering defect: the rendered notification content is decoded back into live HTML after it has already passed through the Simply Schedule Appointments WordPress plugin before 1.6.12.4's wp_kses_post() filter, so a double-encoded payload survives intake and is reintroduced as an executable element at render time.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Simply Schedule Appointments Plugin | — | Update simply-schedule-appointments plugin to version 1.6.12.4, or a newer patched version | Jul 30, 2026 | Jul 6, 2026 |
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