What the vulnerability does
01Description
The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to blind SQL Injection via the `order` and `append_where_sql` parameters in all versions up to, and including, 1.6.9.9 due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. This makes it possible for unauthenticated attackers to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database.
Explanation of Vulnerability in Simple Terms
02Summary
The Simply Schedule Appointments Booking Plugin for WordPress contains a SQL injection vulnerability in versions up to 1.6.9.9. An attacker can craft malicious input to query or modify the site's database without authentication. This allows reading sensitive data like user credentials and appointment information, or altering database records. Update immediately to a patched version.
What an attacker can do
03Attacker Capabilities
Read or modify the site's database without logging in, including user data and appointment records.
Potential impact on your site
04Site Impact
Attackers can steal user credentials, appointment details, and other sensitive database information, or corrupt your site's data.
Conditions required to exploit
05Prerequisites
Network access only; no authentication or user interaction required.
Key dates
06Disclosure timeline
January 14, 2026
CVE published
April 8, 2026
Record updated
