Appointment Booking Calendar Plugin up to 1.6.9.16 on WordPress embed-inner-admin authorization

Summaryinfo

A vulnerability classified as problematic was found in Appointment Booking Calendar Plugin up to 1.6.9.16 on WordPress. Affected is an unknown function of the file /wp-json/ssa/v1/embed-inner-admin. The manipulation results in authorization. This vulnerability is reported as CVE-2025-13754. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Appointment Booking Calendar Plugin up to 1.6.9.16 on WordPress. Affected is an unknown function of the file /wp-json/ssa/v1/embed-inner-admin. The manipulation with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as CWE-862. The product does not perform an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality. CVE summarizes:

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.

The advisory is shared for download at wordfence.com. This vulnerability is traded as CVE-2025-13754. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 12/20/2025).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Appointment Software

Name

• Appointment Booking Calendar Plugin

Version

• 1.6.9.0
• 1.6.9.1
• 1.6.9.2
• 1.6.9.3
• 1.6.9.4
• 1.6.9.5
• 1.6.9.6
• 1.6.9.7
• 1.6.9.8
• 1.6.9.9
• 1.6.9.10
• 1.6.9.11
• 1.6.9.12
• 1.6.9.13
• 1.6.9.14
• 1.6.9.15
• 1.6.9.16

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