The Salon Booking System WordPress plugin before 10.31.11 does not restrict one of its REST API endpoints to salon staff, allowing any authenticated user, such as a subscriber, to retrieve every discount coupon configured on the site, including coupons the administrator has chosen to hide from customers, together with their amounts, validity dates and usage limits.

The Salon Booking System WordPress plugin before 10.31.11 does not restrict which user account its salon staff roles may edit through the customers management screen, allowing users with the Salon Staff or Salon Worker role to reset any other user's role, including administrators, to a customer and to overwrite arbitrary profile fields on any account, leading to loss of administrative access and potential site lockout.

The Salon Booking System WordPress plugin before 10.31.11 does not validate a user-supplied image URL before fetching it server-side and writing the response to a publicly accessible location under an attacker-chosen filename, allowing users with the Salon Staff role or higher to force the server to read internal-only resources and disclose them, and to store a malicious SVG that runs arbitrary scripts in the site's origin for anyone who opens it.

The Salon Booking System WordPress plugin before 10.31.11 does not prevent users holding its custom salon staff role from assigning arbitrary capabilities to other accounts when editing a customer, allowing them to escalate any account to administrator and take over the site.

The Salon Booking System WordPress plugin before 10.31.11 does not enforce a minimum of zero when subtracting a fixed-amount discount from a booking's total, allowing an unauthenticated visitor who knows a valid discount code to create a confirmed booking stored with a negative total.

The Salon Booking System WordPress plugin before 10.31.9 does not correctly verify the authenticity of REST API requests and discards WordPress core's nonce check for cookie-authenticated sessions across the whole REST API, allowing unauthenticated attackers who trick a logged-in administrator into clicking a crafted link to forge requests in that administrator's browser, up to creating a new administrator account.

The Salon Booking System WordPress plugin before 10.31.3 does not restrict several of its booking REST API routes to users with the appropriate capability, allowing any authenticated user such as a subscriber to read every customer's booking records, including their personal data.

The Salon Booking System WordPress plugin before 10.31.9 does not properly check authorization before creating a booking and trusts a caller-supplied user identifier and booking status, allowing unauthenticated attackers to create bookings attributed to arbitrary users, overwrite those users' stored contact details, and mark bookings as paid or confirmed without any payment.

The Salon Booking System WordPress plugin before 10.31.9 does not generate its booking-API access tokens from a secure random source, instead deriving them from a value hardcoded in the Salon Booking System WordPress plugin before 10.31.9 and the second at which a token was issued. An attacker able to constrain when a staff or administrator token was issued can compute a valid token and access the booking API as that user, including an administrator.

The Salon Booking System – Appointment Booking for Salons, Barbershops & Spas plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'sln[<checkout-field-key>]' parameter in all versions up to, and including, 10.31.9 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. Exploitation requires that the site administrator has configured at least one custom checkout field of type Html or File, which is a standard documented plugin feature.

Unauthenticated Privilege Escalation in Salon booking system <= 10.31.7 versions.

Unrestricted Upload of File with Dangerous Type vulnerability in Salon Booking System Salon booking system.This issue affects Salon booking system: from n/a through 9.5.

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in Salon Booking System Salon booking system allows File Manipulation.This issue affects Salon booking system: from n/a through 9.9.

Improper Privilege Management vulnerability in Salon Booking System Salon booking system allows Privilege Escalation.This issue affects Salon booking system: from n/a through 8.6.

The Salon booking system plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the SLNActionAjaxImportAssistants function along with missing authorization checks in all versions up to, and including, 10.2. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.

The Salon Booking System, Appointment Scheduling for Salons, Spas & Small Businesses WordPress plugin before 1.9.4 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 unfilteredhtml capability is disallowed (for example in multisite setup).

The Salon booking system WordPress plugin through 9.6.5 does not sanitise and escape some of its settings, which could allow high privilege users such as admin (or editor depending on Salon booking system WordPress plugin through 9.6.5 configuration) to perform Stored Cross-Site Scripting attacks even when the unfilteredhtml capability is disallowed (for example in multisite setup)