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CVE-2026-125437

WordPress Simply Schedule Appointments plugin <= 1.6.13.0 - Broken Access Control vulnerability

Missing Authorization vulnerability in NSquared Simply Schedule Appointments simply-schedule-appointments allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Simply Schedule Appointments: from n/a through 1.6.13.0.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Nsquared Wordpress-extensions
Products
Simply Schedule Appointments Simply Schedule Appointments
CVE-2026-16541

Simply Schedule Appointments < 1.6.12.17 - Team Member+ User Email Disclosure via Users and Customers REST Endpoints

The Simply Schedule Appointments WordPress plugin before 1.6.12.17 does not restrict the user records returned by some of its REST endpoints to those the requester is entitled to see, allowing users with a low-privileged staff role to disclose the names and email addresses of arbitrary registered users.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Wordpress-extensions
Products
Simply Schedule Appointments
CVE-2026-110381

WordPress Simply Schedule Appointments plugin <= 1.6.12.35 - Insecure Direct Object References (IDOR) vulnerability

Authorization Bypass Through User-Controlled Key vulnerability in NSquared Simply Schedule Appointments simply-schedule-appointments allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Simply Schedule Appointments: from n/a through 1.6.12.35.

CVSS 3.1 · 6.3 Medium EPSS < 1% KEV · Not listed
Vendors
Nsquared Wordpress-extensions
Products
Simply Schedule Appointments Simply Schedule Appointments
CVE-2026-104000

Simply Schedule Appointments <= 1.6.12.35 - Unauthenticated Stored Cross-Site Scripting via 'status' Parameter via /wp-json/ssa/v1/appointments/{id}

The Simply Schedule Appointments plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'status' parameter in all versions up to, and including, 1.6.12.35 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The malicious payload is stored unconditionally because debug logging is enabled by default, and the debug-log viewer is accessible to anyone holding the site-wide Support PIN (an HMAC-MD5 of AUTH_SALT displayed in wp-admin), meaning the injected script will execute against the administrator's session during ordinary support or troubleshooting workflows.

CVSS 3.1 · 7.2 High EPSS < 1% KEV · Not listed
Vendors
Croixhaug Wordpress-extensions
Products
Simply Schedule Appointments Simply Schedule Appointments
CVE-2026-110382

WordPress Simply Schedule Appointments plugin <= 1.6.12.35 - Cross Site Scripting (XSS) vulnerability

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in NSquared Simply Schedule Appointments simply-schedule-appointments allows Stored XSS.This issue affects Simply Schedule Appointments: from n/a through 1.6.12.35.

CVSS 3.1 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Nsquared Wordpress-extensions
Products
Simply Schedule Appointments Simply Schedule Appointments
CVE-2026-6723

Appointment Booking Calendar <= 1.6.11.11 - Incorrect Authorization to Unauthenticated Sensitive Field Modification via Appointment Public Token

The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to Incorrect Authorization in all versions up to, and including, 1.6.11.11. This is due to the appointment update REST API endpoint not restricting which fields can be modified by token-authenticated customers. This makes it possible for unauthenticated attackers to modify admin-controlled fields on that appointment, including faking payment confirmation, reassigning the appointment to another user, and changing the service type.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Croixhaug Wordpress-extensions
Products
Simply Schedule Appointments Simply Schedule Appointments
CVE-2026-92245

Simply Schedule Appointments <= 1.6.12.32 - Missing Authorization to Unauthenticated Sensitive Information Exposure and Arbitrary Appointment Deletion via 'recursive' Parameter on the appointment_types REST Endpoint via Public Nonce

The Simply Schedule Appointments plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 1.6.12.32 via the 'recursive' parameter. This makes it possible for unauthenticated attackers to extract customer PII — including names, email addresses, phone numbers, and custom form field data — stored in appointment records, as well as per-appointment public_token values. The leaked per-appointment public_token values also enable unauthenticated attackers to delete arbitrary appointments via the DELETE /wp-json/ssa/v1/appointments/{id} endpoint, which accepts the token as sole authorization.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Croixhaug Wordpress-extensions
Products
Simply Schedule Appointments Simply Schedule Appointments
CVE-2026-91109

Simply Schedule Appointments <= 1.6.12.31 - Insecure Direct Object Reference to Authenticated (Subscriber+) Sensitive Information Disclosure via 'complete_group' Parameter

The Simply Schedule Appointments plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 1.6.12.31 via the 'complete_group' parameter due to missing validation on a user controlled key. This makes it possible for authenticated attackers, with subscriber-level access and above, to disclose every co-booker's private per-appointment id_token (exposed as public_token) alongside their PII (name and email address), then use each leaked token to read, overwrite arbitrary appointment meta on, or cancel the co-booker's appointment via the same REST controller. Exploitation requires the attacker to possess a valid id_token for any single appointment within the targeted group booking.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Croixhaug Wordpress-extensions
Products
Simply Schedule Appointments Simply Schedule Appointments