SQL Injection in Croixhaug Appointment Booking Calendar — Simply Schedule Appointments Plugin
CVE-2026-7797
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.
Vulnerability class: SQL Injection
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.007 (49.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.007 · change: +0.001
Affected products
Weakness classification (CWE)
References
- www.wordfence.com/threat-intel/vulnerabilities/id/db3bddbd-44b0-4105-9039-0d669…
- plugins.trac.wordpress.org/browser/simply-schedule-appointments/trunk/includes/…
- plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.11.2/i…
- plugins.trac.wordpress.org/browser/simply-schedule-appointments/trunk/includes/…
- plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.11.2/i…
- plugins.trac.wordpress.org/browser/simply-schedule-appointments/trunk/includes/…
- plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.11.2/i…
- plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.10.2/i…
- plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.10.2/i…
- plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.10.2/i…
Frequently asked questions
- What is CVE-2026-7797?
- CVE-2026-7797 is a high-severity vulnerability in Croixhaug Appointment Booking Calendar — Simply Schedule Appointments Plugin, classified under SQL Injection. CVSS score: 7.5/10. Published 2026-05-28.
- How severe is CVE-2026-7797?
- High severity. CVSS v3 base score is 7.5 out of 10.