CVE-2026-6286
Vulnérabilité élevée dans Booking for Appointments and Events Calendar – Amelia (melograno)
Description
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.
Gravité et risque d'exploitation
CVE-2026-6286 obtient un score CVSS de 7.2/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.62 %, ce qui la place devant 48.9 % des CVE référencées.
Que faire ?
- Vérifiez si Booking for Appointments and Events Calendar – Amelia (versions <=2.2, 0) est présent sur votre parc.
- Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
- À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
- Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.
Références
- https://www.wordfence.com/threat-intel/vulnerabilities/id/a330336e-82ad-41f4-b1b1-d93d9905aabd?source=cve
- https://plugins.trac.wordpress.org/browser/ameliabooking/trunk/redesign/dist/index.js#L199
- https://plugins.trac.wordpress.org/browser/ameliabooking/tags/2.1.3/redesign/dist/index.js#L199
- https://plugins.trac.wordpress.org/browser/ameliabooking/trunk/src/Application/Services/Booking/BookingApplicationService.php#L302
- https://plugins.trac.wordpress.org/browser/ameliabooking/tags/2.1.3/src/Application/Services/Booking/BookingApplicationService.php#L302
- https://plugins.trac.wordpress.org/browser/ameliabooking/trunk/src/Application/Commands/Command.php#L186
- https://plugins.trac.wordpress.org/browser/ameliabooking/tags/2.1.3/src/Application/Commands/Command.php#L186
- https://plugins.trac.wordpress.org/browser/ameliabooking/trunk/src/Application/Commands/Booking/Appointment/AddBookingCommandHandler.php#L46
- https://plugins.trac.wordpress.org/browser/ameliabooking/tags/2.1.3/src/Application/Commands/Booking/Appointment/AddBookingCommandHandler.php#L46
- https://plugins.trac.wordpress.org/changeset/3499608/
- https://plugins.trac.wordpress.org/changeset/3505826/
