CVE-2025-25173: Fasterthemes Fastbook

High severity, CVSS 7.1. EPSS: 0.3% chance of exploitation in the next 30 days.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in FasterThemes FastBook fastbook-responsive-appointment-booking-and-scheduling-system allows Stored XSS.This issue affects FastBook: from n/a through <= 1.1.

Affected products

• Fasterthemes Fastbook: up to and including 1.1

Published 2025-06-27. Last modified 2026-06-17.