CVE-2026-96573
Received Received - Intake

Stored DOM-Based XSS in Appointment Hour Booking WordPress Plugin

Publication date: 2026-10-01

Last updated on: 2026-10-01

Assigner: Wordfence

Description
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.

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Meta Information

Published
2026-10-01
Last Modified
2026-10-01
Generated
2026-10-01
AI Q&A
2026-10-01
EPSS Evaluated
N/A
NVD
CVE-2026-96573
EUVD
EUVD-2026-90566

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
appointment_hour_booking booking_calendar to 1.5.97 (inc)
wp_booking_calendar appointment_hour_booking to 1.5.97 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This vulnerability is a Stored DOM-Based Cross-Site Scripting (XSS) flaw in the Appointment Hour Booking – Booking Calendar WordPress plugin. It allows unauthenticated attackers to inject malicious scripts into web pages via Booking Form Single-Line Field. The issue arises due to insufficient input sanitization and output escaping in versions up to 1.5.97.

Detection Guidance

This vulnerability is specific to the WordPress Appointment Hour Booking plugin. Detection involves checking the plugin version and configuration. Inspect WordPress installations for the plugin and verify if the version is 1.5.97 or lower. Check the 'list_readmore_numberofwords' setting in the plugin's Other Parameters to confirm if it has a positive integer value.

Impact Analysis

An attacker could exploit this to inject scripts that run when users visit affected pages. This could lead to theft of cookies, session tokens, or other sensitive data. Users might unknowingly execute malicious code, compromising their accounts or personal information.

Compliance Impact

This vulnerability could lead to unauthorized access to user data, violating GDPR's data protection principles and HIPAA's security requirements. It may result in data breaches, leading to legal penalties, reputational damage, and loss of trust.

Mitigation Strategies

Immediately update the Appointment Hour Booking plugin to the latest version beyond 1.5.97. If updating is not possible, disable or remove the plugin until a patch is applied. Ensure input sanitization and output escaping are properly configured in the plugin settings.

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