Melograno Booking for Appointments and Events Calendar Plugin Calendar View BookingApplicationService.php sanitize_text_field cross site scripting

Summaryinfo

A vulnerability classified as problematic has been found in Melograno Booking for Appointments and Events Calendar Plugin up to 2.2. Affected by this issue is the function sanitize_text_field of the file BookingApplicationService.php of the component Calendar View. Performing a manipulation of the argument firstName/lastName results in cross site scripting. This vulnerability is reported as CVE-2026-6286. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Melograno Booking for Appointments and Events Calendar Plugin up to 2.2. This affects the function sanitize_text_field of the file BookingApplicationService.php of the component Calendar View. The manipulation of the argument firstName/lastName 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. The summary by CVE is:

The Booking for Appointments and Events Calendar – Amelia plugin for WordPress is vulnerable to Stored Cross-Site Scripting via customer name fields in versions up to and including 2.2. This is due to an authentication bypass where the AddBookingCommand explicitly skips nonce verification (Command.php line 186), allowing unauthenticated users to submit booking data. While the plugin applies sanitize_text_field() to customer firstName and lastName fields (BookingApplicationService.php lines 302-308), this function only removes HTML tags and preserves special characters including double quotes. The vulnerability manifests in the administrative Calendar view where a FullCalendar eventContent callback interpolates customer names directly into JavaScript template literals (redesign/dist/index.js line 199) and renders them via innerHTML without proper HTML entity encoding. Because double quotes are preserved, an attacker can inject payloads like '" onmouseover="alert(document.cookie)"' to break out of the title attribute and inject malicious event handlers. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that will execute when an administrator accesses the Calendar page and hovers over the malicious appointment.

It is possible to read the advisory at wordfence.com. This vulnerability is uniquely identified as CVE-2026-6286 since 04/14/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

By approaching the search of inurl:BookingApplicationService.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• WordPress Plugin

Vendor

• Melograno

Name

• Booking for Appointments and Events Calendar Plugin

Version

• 2.0
• 2.1
• 2.2

CPE 2.3info

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• 🔒
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CPE 2.2info

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