CVE-2026-7797: Simply Schedule Appointments SQL injection in append_where_sql

CVE-2026-7797 · Severity: high · CVSS 7.5 · Published 2026-05-28

A popular WordPress booking plugin is vulnerable to a security flaw that allows unauthorized individuals to access sensitive database information. By exploiting a weakness in how the plugin handles appointment data, an attacker could potentially steal customer details or site configuration data. This issue affects websites using the Simply Schedule Appointments plugin for managing calendars and bookings.

Quick answers

Is CVE-2026-7797 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-7797 being exploited in the wild.
How severe is CVE-2026-7797?
High severity, with a CVSS score of 7.5, published 28 May 2026.
Which products and versions are affected?
The Appointment Booking Calendar Simply Schedule Appointments Booking Plugin up to, and including, 1.6.11.8.
Is there a fix for CVE-2026-7797?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-7797 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-7797?
Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The Simply Schedule Appointments plugin for WordPress (versions up to 1.6.11.8) contains a time-based blind SQL injection vulnerability in the 'append_where_sql' parameter. The root cause is insufficient escaping of user-supplied input and a lack of SQL query preparation. Unauthenticated access is possible via the /appointments/bulk REST endpoint because it incorrectly validates a public nonce found in the frontend JavaScript. To bypass blocklist checks, an attacker must use a PUT request with an application/x-www-form-urlencoded body, which prevents PHP superglobals from being populated. This allows the attacker to append arbitrary SQL queries and exfiltrate data from the database. The issue is fixed in version 1.6.11.9.

Affected products

  • The Appointment Booking Calendar Simply Schedule Appointments Booking Plugin up to, and including, 1.6.11.8

Timeline

  • 2026-05-28: advisory: NVD publication date
  • 2026-05-28: disclosed: Wordfence disclosure date

References

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