CVE-2026-1083

Unknown Unknown - Not Provided

Stored XSS in Appointment Hour Booking Plugin Affects Multisite

Publication date: 2026-01-28

Last updated on: 2026-01-28

Assigner: Wordfence

Description

The Appointment Hour Booking – Booking Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via form field configuration parameters in all versions up to, and including, 1.5.60 due to insufficient input sanitization and output escaping on the 'Min length/characters' and 'Max length/characters' field configuration values. This makes it possible for authenticated attackers, with administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses the form builder interface. This only affects multi-site installations and installations where unfiltered_html has been disabled.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-01-28

Last Modified

2026-01-28

Generated

2026-07-06

AI Q&A

2026-01-29

EPSS Evaluated

2026-07-05

NVD

CVE-2026-1083

EUVD

EUVD-2026-4866

Affected Vendors & Products

Vendor	Product	Version / Range
appointment_hour_booking	booking_calendar	to 1.5.60 (inc)

Helpful Resources

Exploitability

CWE

KEV

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.

Attack-Flow Graph

Executive Summary

This vulnerability is a Stored Cross-Site Scripting (XSS) issue in the Appointment Hour Booking – Booking Calendar plugin for WordPress. It occurs because the plugin does not properly sanitize or escape input in the 'Min length/characters' and 'Max length/characters' form field configuration parameters. Authenticated users with administrator-level access or higher can inject malicious scripts that will execute when other users access the form builder interface. This affects multi-site installations and installations where the unfiltered_html setting is disabled.

Impact Analysis

An attacker with administrator-level access can inject malicious scripts into the plugin's form builder interface. These scripts execute when users access the interface, potentially leading to unauthorized actions, data theft, or session hijacking. Since the vulnerability requires high privileges and affects multi-site or restricted HTML installations, the impact is limited but can compromise the integrity and security of the affected WordPress sites.

Mitigation Strategies

To mitigate this vulnerability, ensure that you update the Appointment Hour Booking – Booking Calendar plugin to a version later than 1.5.60 where the issue is fixed. Additionally, restrict administrator-level access to trusted users only, and consider enabling unfiltered_html if possible, or review multi-site installation configurations to reduce exposure.

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