Description

The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's ssa_admin_upcoming_appointments, ssa_admin_upcoming_appointments, and ssa_past_appointments shortcodes in all versions up to, and including, 1.6.8.30 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Classification

CVE ID: CVE-2025-4667

CVSS Base Severity: MEDIUM

CVSS Base Score: 6.4

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

Affected Products

Vendor: croixhaug

Product: Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.04% (probability of being exploited)

EPSS Percentile: 9.19% (scored less or equal to compared to others)

EPSS Date: 2025-06-15 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-4667
https://www.wordfence.com/threat-intel/vulnerabilities/id/414173b9-d23e-4e44-bf8c-77a074bb09e9?source=cve
https://wordpress.org/plugins/simply-schedule-appointments/#developers
https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.8.24/includes/class-shortcodes.php#L718
https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.8.24/includes/class-shortcodes.php#L754
https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.8.24/includes/class-shortcodes.php#L784
https://plugins.trac.wordpress.org/changeset/3306064/simply-schedule-appointments/tags/1.6.8.32/includes/class-shortcodes.php

Timeline