CVE-2026-18777: Unknown Truebooker

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

The TrueBooker WordPress plugin before 1.2.7 does not have proper authorisation checks in one of its AJAX actions, allowing unauthenticated users to change the status of arbitrary appointments, as well as to trigger notification emails to the affected customers.

Affected products

• Unknown Truebooker: before 1.2.7 (fixed in 1.2.7)

Published 2026-08-19. Last modified 2026-08-26.