CVE-2026-7797 HIGH

CVE-2026-7797: Appointment Booking Calendar <= 1.6.11.8 - Unauthenticated SQL Injection via 'append_where_sql' Parameter

Vendor Croixhaug
Product Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin
Weakness CWE-89 · SQLi
Published May 28, 2026
Last update May 28, 2026
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

What the vulnerability does

01Description

The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to time-based blind SQL Injection via the 'append_where_sql' parameter in all versions up to, and including, 1.6.11.8 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. The /appointments/bulk REST endpoint is reachable by unauthenticated attackers because its permission check accepts a public nonce that is embedded in the booking widget's frontend JavaScript (ssa.api.public_nonce) and visible to all site visitors; exploitation requires issuing the request as a PUT with an application/x-www-form-urlencoded body so that PHP's superglobals are not populated and the blocklist check silently passes.

Explanation of Vulnerability in Simple Terms

02Summary

The Simply Schedule Appointments Booking Plugin for WordPress contains a SQL injection vulnerability in versions up to 1.6.11.8. An unauthenticated attacker can craft malicious input to extract sensitive data from the site's database, including user credentials and appointment information. No user interaction is required to exploit this flaw.

What an attacker can do

03Attacker Capabilities

Read sensitive data from the site's database without authentication.

Potential impact on your site

04Site Impact

Attackers can steal user data, credentials, and appointment records directly from your database.

Conditions required to exploit

05Prerequisites

Network access to the site; no authentication or user interaction required.

Key dates

06Disclosure timeline

May 28, 2026 CVE published
May 28, 2026 Record updated