CVE-2026-16282
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk8th percentile - higher than 8% of all known CVEs
Summary
The Appointment Hour Booking WordPress plugin before version 1.5.88 does not validate a client-supplied booking price against the server-side configured service price. Unauthenticated users can submit an arbitrary final price (including zero or negative) that is stored as the authoritative booking price, corrupting booking and payment records.
Risk Assessment
An attacker can alter booking prices, leading to financial losses, incorrect reports, and billing issues. It can also disrupt the integrity of booking data.
Recommendation
Update the Appointment Hour Booking plugin to version 1.5.88 or later, which includes the price validation fix. Additionally, consider adding extra server-side validation for critical operations.
Other vulnerabilities in Appointment Hour Booking
See all- CVE-2026-96573High
The Appointment Hour Booking – Booking Calendar plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via Booking Form Single-Line Field via Schedule Calendar List Renderer in all versions up to, and including, 1.5.97 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 the 'list_readmore_numberofwords' Other Parameters setting to be configured with a positive integer value; the default value of 0 bypasses the decode-and-truncate branch entirely and is not exploitable through this sink.
- CVE-2026-65514Medium
The Appointment Hour Booking plugin versions up to 1.5.86 contain a Cross Site Scripting (XSS) vulnerability exploitable by contributors. A contributor can inject malicious JavaScript code.
- CVE-2026-66679Medium
Broken Access Control vulnerability in Appointment Hour Booking versions up to 1.5.91. The attack does not require authentication.
Original NVD description (English source)
The Appointment Hour Booking WordPress plugin before 1.5.88 does not validate a client-supplied booking price against the server-side configured service price, allowing unauthenticated users to submit an arbitrary final price (including zero or negative) that is stored as the authoritative booking price, corrupting booking and payment records.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS