Junglewise Threat Intelligence

CVE-2026-7797: Simply Schedule Appointments SQL injection in append_where_sql

CVE-2026-7797 · Severity: high · CVSS 7.5 · Published 2026-05-28

Technologies: The Appointment Booking Calendar Simply Schedule Appointments Booking Plugin.

Executive brief

A popular WordPress booking plugin is vulnerable to a security flaw that allows unauthorized individuals to access sensitive database information. By exploiting a weakness in how the plugin handles appointment data, an attacker could potentially steal customer details or site configuration data. This issue affects websites using the Simply Schedule Appointments plugin for managing calendars and bookings.

Technical details

The Simply Schedule Appointments plugin for WordPress (versions up to 1.6.11.8) contains a time-based blind SQL injection vulnerability in the 'append_where_sql' parameter. The root cause is insufficient escaping of user-supplied input and a lack of SQL query preparation. Unauthenticated access is possible via the /appointments/bulk REST endpoint because it incorrectly validates a public nonce found in the frontend JavaScript. To bypass blocklist checks, an attacker must use a PUT request with an application/x-www-form-urlencoded body, which prevents PHP superglobals from being populated. This allows the attacker to append arbitrary SQL queries and exfiltrate data from the database. The issue is fixed in version 1.6.11.9.

Affected products

  • The Appointment Booking Calendar Simply Schedule Appointments Booking Plugin up to, and including, 1.6.11.8

Timeline

  • 2026-05-28: advisory: NVD publication date
  • 2026-05-28: disclosed: Wordfence disclosure date

References