CVE-2026-3658: Appointment Booking Calendar <= 1.6.10.0 - Unauthenticated SQL Injection via 'fields' Parameter
The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to SQL Injection via the 'fields' parameter in all versions up to, and including, 1.6.10.0 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, including usernames, email addresses, and password hashes.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-3658?
CVE-2026-3658 has a high severity due to the potential for unauthenticated SQL injection, which can lead to significant data breaches.
How do I fix CVE-2026-3658?
To fix CVE-2026-3658, update the Appointment Booking Calendar plugin to the latest version above 1.6.10.0.
What type of vulnerability is CVE-2026-3658?
CVE-2026-3658 is classified as an SQL injection vulnerability.
In which versions is CVE-2026-3658 present?
CVE-2026-3658 is present in all versions of the Appointment Booking Calendar plugin up to and including 1.6.10.0.
Can CVE-2026-3658 be exploited without authentication?
Yes, CVE-2026-3658 can be exploited unauthenticated, making it particularly dangerous for sites using affected versions.