CVE-2026-16540: Unknown Simply Schedule Appointments

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

The Simply Schedule Appointments WordPress plugin before 1.6.12.6 does not correctly restrict a bulk appointment operation to the requester's own records, allowing unauthenticated users to retrieve the personal data of all appointments across the site and, on premium editions, to permanently delete them.

Affected products

• Unknown Simply Schedule Appointments: before 1.6.12.6 (fixed in 1.6.12.6)

Published 2026-08-02. Last modified 2026-08-26.