CVE-2025-13754

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

2025-12-18 18:13
Marcin Dudek (dudekmar)

Strategic Overview

Status
Patched in 1.6.9.17
Affected Plugin
Simply Schedule Appointments
Affected Version
<= 1.6.9.16
CVSS
5.3Medium
Weakness type
CWE-862 · Missing Authorization
CVE
CVE-2025-13754
View all Simply Schedule Appointments vulnerabilities

At a glance

CVE-2025-13754 is a medium-severity Missing Authorization vulnerability in the Simply Schedule Appointments WordPress plugin, affecting versions <= 1.6.9.16. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.6.9.17; sites on affected versions should update now. Disclosed December 2025, reported by Marcin Dudek (dudekmar).

Vulnerability Overview

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.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.

CWE-862: Missing Authorization

Reaching this weakness in Simply Schedule Appointments <= 1.6.9.16 takes no account at all. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.

Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. For Simply Schedule Appointments the fix is 1.6.9.17: builds <= 1.6.9.16 are affected, anything from 1.6.9.17 onward is not.

Remediation

Update to version 1.6.9.17, or a newer patched version

How does WordSec protect against this?

This one needs no account at all, which puts it outside what login hardening can reach; WordSec's login security narrows the account-level paths around it, and the firewall is what inspects the request itself. None of that substitutes for the fix: Simply Schedule Appointments 1.6.9.17 closes this, and updating the plugin is the step that ends it.

  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2025-13754https://www.wordfence.com/threat-intel/vulnerabilities/id/10d7a50c-41e9-41b7-a171-d72dbe08e7b7https://nvd.nist.gov/vuln/detail/CVE-2025-13754

Related records

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