CVE-2025-66531 identifies a Cross-Site Request Forgery (CSRF) vulnerability in the Dimitri Grassi Salon booking system, affecting versions up to 10.30.3. CSRF vulnerabilities occur when an attacker tricks an authenticated user into submitting a forged request to a web application, exploiting the user's active session to perform unauthorized actions. In this case, the salon booking system does not adequately verify the legitimacy of requests, allowing attackers to potentially manipulate bookings, cancel appointments, or alter user data without the user's consent. The vulnerability does not require the attacker to have direct access to user credentials but does require the victim to be authenticated and to visit a malicious website or click a crafted link. No CVSS score has been assigned yet, and no public exploits are known, but the vulnerability is published and recognized by Patchstack. The lack of patch links suggests that a fix may not be available yet, increasing the urgency for organizations to implement compensating controls. The vulnerability primarily threatens the integrity of the booking system and could also affect availability if attackers disrupt booking operations. Since salon booking systems often handle sensitive customer data and scheduling, exploitation could also indirectly impact confidentiality. The vulnerability is particularly relevant for small and medium-sized enterprises in the personal services sector that rely on this software for daily operations.

For European organizations, this CSRF vulnerability could lead to unauthorized manipulation of salon bookings, resulting in operational disruptions, customer dissatisfaction, and potential financial losses. Attackers could exploit the vulnerability to create fraudulent bookings, cancel legitimate appointments, or alter customer data, undermining trust in the service provider. This could also lead to reputational damage, especially for businesses that rely heavily on online booking systems. In regulated environments, improper handling of customer data or service disruptions could trigger compliance issues under GDPR. The impact is more pronounced in countries with a dense network of small businesses in the beauty and wellness sector, where such booking systems are widely used. Additionally, attackers could leverage this vulnerability as a foothold for further attacks, such as phishing campaigns targeting customers or staff. The absence of known exploits in the wild currently limits immediate risk, but the public disclosure increases the likelihood of future exploitation attempts.

Organizations should implement anti-CSRF tokens in all state-changing requests within the Dimitri Grassi Salon booking system to ensure that requests originate from legitimate users. Validating the HTTP Referer or Origin headers can provide an additional layer of defense against forged requests. Administrators should monitor for unusual booking activities or patterns that could indicate exploitation attempts. User education is critical; staff and customers should be warned about phishing and social engineering tactics that might lead to CSRF attacks. Until an official patch is released, consider deploying web application firewalls (WAFs) with rules designed to detect and block CSRF attack patterns. Regularly update and audit the booking system and related dependencies to ensure all security best practices are followed. If possible, restrict session lifetimes and require re-authentication for sensitive operations. Finally, maintain incident response plans tailored to web application attacks to quickly address any exploitation attempts.