The vulnerability in CamaleonCMS's cama_contact_form plugin is a stored cross-site scripting issue caused by improper sanitization of the before_html field submitted through the contact form edit endpoint. Because this endpoint lacks proper authorization controls, low-privileged authenticated attackers can inject malicious HTML content that is persisted in the database. When other users view the contact form, the malicious scripts execute in their browsers, enabling attacks such as cookie theft, forged requests against the admin interface, and session hijacking. The CVSS 4.0 vector indicates network attack vector, low attack complexity, no attack traceability, low privileges required, user interaction needed, and high impacts on confidentiality, integrity, and availability.

Successful exploitation allows attackers to execute arbitrary scripts in the context of other users' browsers when they load the contact form. This can lead to theft of authentication cookies, unauthorized actions performed with the victim's privileges on the admin interface, and full session takeover of affected users. The vulnerability compromises confidentiality, integrity, and availability of the affected system's user sessions.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the contact form edit endpoint to trusted users only and consider disabling or limiting the cama_contact_form plugin functionality. Implementing additional input validation and output encoding on the before_html field may reduce risk.