Appointment Booking Calendar <= 1.6.9.29 - Missing Authorization to Unauthenticated Sensitive Information Exposure via Settings REST API Endpoint
The Appointment Booking Calendar — Simply Schedule Appointments plugin for WordPress is vulnerable to unauthorized access of sensitive data in all versions up to and including 1.6.9.29. This is due to two compounding weaknesses: (1) a non-user-bound public_nonce is exposed to unauthenticated users through the public /wp-json/ssa/v1/embed-inner REST endpoint, and (2) the get_item() method in SSA_Settings_Api relies on nonce_permissions_check() for authorization (which accepts the public nonce) but does not call remove_unauthorized_settings_for_current_user() to filter restricted fields. This makes it possible for unauthenticated attackers to access admin-only plugin settings including the administrator email, phone number, internal access tokens, notification configurations, and developer settings via the /wp-json/ssa/v1/settings/{section} endpoint. The exposure of appointment tokens also allows an attacker to modify or cancel appointments.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| WordPress plugin | Simply Schedule Appointments | <= 1.6.9.29 | 1.6.10.0 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N- Weakness (CWE)
CWE-862- Platform
- WordPress
- Package
Simply Schedule Appointments- Disclosed
- 12.03.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
Wordfence Intelligence - 5970b8d6-0041-4c30-a6ce-fe67ebf415f5 - Wordfence Intelligence
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Copyright 2012-2026 Defiant Inc.
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Wordfence Intelligence - Defiant, Inc. Copyright Defiant, Inc. All rights reserved except as granted below. License grant, section 3.1 of the Wordfence Intelligence Terms and Conditions (January 26, 2026): Subject to this Agreement, Company hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute the Service. Any copy you make for such purposes is authorized provided that you reproduce Company’s copyright designation, this license, and the license of any disclosed Company licensor in any such copy. Full applicable Agreement: https://www.wordfence.com/wordfence-intelligence-terms-and-conditions/
Vulnerability history: Simply Schedule Appointments
All published vulnerabilities of this package (WordPress plugin), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 48
- First → latest
- 08.2022 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 17
- Medium 31
Disclosures per year
- 2022: 2
- 2023: 1
- 2024: 8
- 2025: 4
- 2026: 33
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Appointment Booking Calendar <= 1.6.9.29 - Missing Authorization to Unauthenticated Sensitive Information Exposure via Settings REST API Endpoint this entry
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