What’s Vulnerable › Vulnerabilities

CVE-2025-13754: Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.9.16 - Missing Authorization to Unauthenticated Sensitive Information Exposure

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-19 · updated 2026-06-17
• Weakness: CWE-862

Description

The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 1.6.9.16. This is due to the plugin exposing its admin embed endpoint at `/wp-json/ssa/v1/embed-inner-admin` without authentication, which leaks plugin settings including staff names, business names, and configuration data that are not publicly displayed on the booking form. This makes it possible for unauthenticated attackers to extract private business configuration. In premium versions with integrations configured, this might also expose other sensitive data including API keys for external services.

Affected products

• croixhaug Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin: through 1.6.9.16

References

• https://plugins.trac.wordpress.org/changeset/3421427/simply-schedule-appointments/trunk/includes/class-shortcodes.php
• https://www.wordfence.com/threat-intel/vulnerabilities/id/10d7a50c-41e9-41b7-a171-d72dbe08e7b7?source=cve

Get alerted when CVE-2025-13754 or the next vulnerability affects your stack