alextselegidis easyappointments up to 1.5.x disable_booking_message cross site scripting

Summaryinfo

A vulnerability described as problematic has been identified in alextselegidis easyappointments up to 1.5.x. Affected by this issue is some unknown functionality. The manipulation of the argument disable_booking_message results in cross site scripting. This vulnerability is known as CVE-2026-52838. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as problematic, was found in alextselegidis easyappointments up to 1.5.x. Affected is an unknown code block. The manipulation of the argument disable_booking_message with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as 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. This is going to have an impact on integrity. CVE summarizes:

Easy!Appointments is a self hosted appointment scheduler. Versions prior to 1.6.0 allow administrators to define a custom "booking disabled" message through the booking settings page. That value is stored in the `disable_booking_message` setting via a rich-text editor and later passed directly to the public `booking_message` view without escaping or sanitization. An authenticated administrator can store HTML or JavaScript in this field, enable disabled-booking mode, and trigger stored XSS in every unauthenticated visitor who opens the public booking page. Version 1.6.0 fixes the issue.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-52838 since 06/08/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation requires an enhanced level of successful authentication. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 1.6.0 eliminates this vulnerability. Applying the patch 629a0415f54f75556c17f4f5d9c77fda1fdbdeae is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Appointment Software

Vendor

• alextselegidis

Name

• easyappointments

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5

License

• open-source

Website

• Product: https://github.com/alextselegidis/easyappointments/

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