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CVE-2026-16540

Simply Schedule Appointments < 1.6.12.6 - Unauthenticated Appointment Data Disclosure and Mass Deletion via purge Endpoint

The Simply Schedule Appointments WordPress plugin before 1.6.12.6 does not correctly restrict a bulk appointment operation to the requester's own records, allowing unauthenticated users to retrieve the personal data of all appointments across the site and, on premium editions, to permanently delete them.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Nsqua Wordpress
Products
Simply Schedule Appointments Wordpress
CVE-2026-15254

Simply Schedule Appointments < 1.6.12.11 - Contributor+ Sensitive Data Disclosure via Admin Shortcode

The Simply Schedule Appointments WordPress plugin before 1.6.12.11 does not perform a capability check on an administrative appointment-listing shortcode, and its per-user result scoping fails open for non-staff users, allowing users with the Contributor role and above to disclose all customers' appointment records, including names, email addresses, phone numbers and notes, across the whole site.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Nsqua Wordpress
Products
Simply Schedule Appointments Wordpress
CVE-2023-50851

WordPress Simply Schedule Appointments Plugin < 1.6.6.1 is vulnerable to SQL Injection

Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in N Squared Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin.This issue affects Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin: from n/a before 1.6.6.1.

CVSS 3.1 · 7.6 High EPSS < 1% KEV · Not listed
Vendors
Nsqua
Products
Simply Schedule Appointments
CVE-2024-1760

Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.6.20 - Cross-Site Request Forgery to Plugin Data Reset

The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.6.6.20. This is due to missing or incorrect nonce validation on the ssa_factory_reset() function. This makes it possible for unauthenticated attackers to reset the plugin's settings via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
Vendors
Nsqua Nsquared
Products
Simply Schedule Appointments Simply Schedule Appointments
CVE-2024-7129

Appointment Booking Calendar < 1.6.7.43 - Admin+ Template Injection to RCE

The Appointment Booking Calendar WordPress plugin before 1.6.7.43 does not escape template syntax provided via user input, leading to Twig Template Injection which further exploited can result to remote code Execution by high privilege such as admins

CVSS 3.1 · 7.2 High EPSS 1.1% KEV · Not listed
Vendors
Nsqua Nsquared
Products
Simply Schedule Appointments Appointment Booking Calendar
CVE-2022-2374

Simply Schedule Appointments < 1.5.7.7 - Admin+ Stored Cross-Site Scripting

The Simply Schedule Appointments WordPress plugin before 1.5.7.7 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup)

CVSS 3.1 · 4.8 Medium EPSS < 1% KEV · Not listed
Vendors
Nsqua
Products
Simply Schedule Appointments
CVE-2022-2373

Simply Schedule Appointments < 1.5.7.7 - Unauthenticated Email Address Disclosure

The Simply Schedule Appointments WordPress plugin before 1.5.7.7 is missing authorisation in a REST endpoint, allowing unauthenticated users to retrieve WordPress users details such as name and email address

CVSS 3.1 · 5.3 Medium EPSS 2.0% KEV · Not listed
Vendors
Nsqua
Products
Simply Schedule Appointments
CVE-2024-7876

Appointment Booking Calendar < 1.6.7.55 - Admin+ Stored XSS

The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin WordPress plugin before 1.6.7.55 does not sanitise and escape some of its Appointment Type settings, which could allow high privilege users such as admin to perform Cross-Site Scripting attacks even when unfiltered_html is disallowed

CVSS 3.1 · 4.8 Medium EPSS < 1% KEV · Not listed
Vendors
Nsqua Nsquared
Products
Simply Schedule Appointments Appointment Booking Calendar
CVE-2024-7877

Appointment Booking Calendar < 1.6.7.55 - Admin+ Stored XSS

The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin WordPress plugin before 1.6.7.55 does not sanitise and escape some of its Notification settings, which could allow high privilege users such as admin to perform Cross-Site Scripting attacks even when unfiltered_html is disallowed

CVSS 3.1 · 4.8 Medium EPSS < 1% KEV · Not listed
Vendors
Nsqua Nsquared
Products
Simply Schedule Appointments Appointment Booking Calendar