The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to Missing Authorization in all versions up to, and including, 1.6.11.8 due to the plugin not properly verifying that a user is authorized to perform an action via the bulk appointments REST API endpoint. This makes it possible for unauthenticated attackers to modify arbitrary appointment records including customer PII, payment status, and meeting URL fields, and to expose full customer PII from existing appointment records via the bulk endpoint response. The public nonce is a static, user-independent value present in the HTML source of any page hosting the [ssa_booking] shortcode, meaning any visitor who has viewed such a page can obtain it and target any appointment in the system without authentication.

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Fixes

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History

Thu, 28 May 2026 11:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 28 May 2026 09:45:00 +0000

Type Values Removed Values Added
First Time appeared Croixhaug
Croixhaug appointment Booking Calendar — Simply Schedule Appointments Booking Plugin
Wordpress
Wordpress wordpress
Vendors & Products Croixhaug
Croixhaug appointment Booking Calendar — Simply Schedule Appointments Booking Plugin
Wordpress
Wordpress wordpress

Thu, 28 May 2026 08:45:00 +0000

Type Values Removed Values Added
Description The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to Missing Authorization in all versions up to, and including, 1.6.11.8 due to the plugin not properly verifying that a user is authorized to perform an action via the bulk appointments REST API endpoint. This makes it possible for unauthenticated attackers to modify arbitrary appointment records including customer PII, payment status, and meeting URL fields, and to expose full customer PII from existing appointment records via the bulk endpoint response. The public nonce is a static, user-independent value present in the HTML source of any page hosting the [ssa_booking] shortcode, meaning any visitor who has viewed such a page can obtain it and target any appointment in the system without authentication.
Title Appointment Booking Calendar <= 1.6.11.8 - Missing Authorization to Unauthenticated Arbitrary Modification via Bulk Appointments REST API Endpoint
Weaknesses CWE-862
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Wordfence

Published:

Updated: 2026-05-28T10:31:56.999Z

Reserved: 2026-04-23T19:11:14.213Z

Link: CVE-2026-6937

cve-icon Vulnrichment

Updated: 2026-05-28T10:31:51.418Z

cve-icon NVD

Status : Received

Published: 2026-05-28T09:16:48.170

Modified: 2026-05-28T09:16:48.170

Link: CVE-2026-6937

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-28T09:30:06Z

Weaknesses