Blind SQL Injection Vulnerability in Appointment Booking Calendar Plugin for WordPress
CVE-2025-12166

7.5HIGH

Key Information:

Vendor

WordPress
Status
Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin
Vendor
CVE Published:
14 January 2026

What is CVE-2025-12166?

The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin for WordPress contains a blind SQL injection vulnerability that affects all versions up to and including 1.6.9.9. This flaw arises from inadequate escaping of user-supplied parameters, notably the order and append_where_sql parameters. As a result, unauthenticated attackers can inject additional SQL queries into existing ones, potentially exposing sensitive information stored in the database.

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Affected Version(s)

Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin * <= 1.6.9.9

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/changeset/3408539/

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Angus Girvan
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