CVE-2026-110034

Salon Booking System <= 10.31.10 - Unauthenticated Negative Booking Total Creation

2026-10-16 00:00

Strategic Overview

Status: Patched in 10.31.11
Affected Plugin: Salon Booking System – Appointment Booking for Salons, Barbershops & Spas
Affected Version: <= 10.31.10
CVSS: 5.3Medium
Weakness type: CWE-602 · Client-Side Enforcement of Server-Side Security
CVE: CVE-2026-110034

View all Salon Booking System – Appointment Booking for Salons, Barbershops & Spas vulnerabilities

At a glance

CVE-2026-110034 is a medium-severity Client-Side Enforcement of Server-Side Security vulnerability in the Salon Booking System WordPress plugin, affecting versions <= 10.31.10. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 10.31.11; sites on affected versions should update now. Disclosed October 2026, reported by vuxvinh.

Vulnerability Overview

The Salon Booking System plugin for WordPress is vulnerable to Payment Bypass in all versions up to, and including, 10.31.10. This is due to missing lower-bound enforcement when subtracting a fixed-amount discount from a booking total, allowing the result to go below zero. This makes it possible for unauthenticated attackers to create confirmed bookings with a negative total by supplying a fixed-amount discount code whose value exceeds the booking price. A valid discount code must exist in the system.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.

CWE-602: Client-Side Enforcement of Server-Side Security

The product is composed of a server that relies on the client to implement a mechanism that is intended to protect the server.

Remediation

Update to version 10.31.11, or a newer patched version

How does WordSec protect against this?

This one needs no account at all, which puts it outside what login hardening can reach; WordSec's login security narrows the account-level paths around it, and the firewall is what inspects the request itself. None of that substitutes for the fix: Salon Booking System 10.31.11 closes this, and updating the plugin is the step that ends it.

Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-110034 https://www.wordfence.com/threat-intel/vulnerabilities/id/0098157e-c3e8-42e4-bd79-c9f2ea26f4db https://nvd.nist.gov/vuln/detail/CVE-2026-110034

Related records

Same weakness class

4.3CVE-2026-11887: Salon Booking System Authenticated (Subscriber+)CVE-2026-11887

Other vulnerabilities in Salon Booking System – Appointment Booking for Salons, Barbershops & Spas

CVSS Vector

5.3

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityNone

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