CVE-2025-30637 is a medium-severity Stored Cross-Site Scripting (XSS) vulnerability affecting Deetronix's Booking Ultra Pro software up to version 1.1.20. The vulnerability arises due to improper neutralization of input during web page generation, classified under CWE-79. Specifically, the application fails to adequately sanitize or encode user-supplied input before embedding it into web pages, allowing malicious actors to inject and store malicious scripts. When other users or administrators access the affected pages, these scripts execute in their browsers within the security context of the Booking Ultra Pro application. The CVSS 3.1 base score is 5.9, reflecting a network attack vector (AV:N), low attack complexity (AC:L), but requiring high privileges (PR:H) and user interaction (UI:R). The scope is changed (S:C), indicating that exploitation can affect resources beyond the vulnerable component. The impact includes low confidentiality, integrity, and availability impacts (C:L/I:L/A:L), consistent with typical Stored XSS effects such as session hijacking, defacement, or unauthorized actions performed on behalf of users. No known exploits are currently reported in the wild, and no patches have been published yet. The vulnerability was reserved in March 2025 and published in June 2025. Booking Ultra Pro is a booking management system, likely used by organizations to handle reservations and scheduling, which may contain sensitive user data and administrative controls. The requirement for high privileges to exploit suggests that attackers must have some level of authenticated access, possibly as a user with booking or administrative rights, and user interaction is needed to trigger the malicious payload execution.

For European organizations using Deetronix Booking Ultra Pro, this vulnerability poses a moderate risk. Attackers with authenticated access could inject malicious scripts that execute in the browsers of other users, potentially leading to session hijacking, unauthorized actions, or data exposure. This could compromise the integrity of booking data, disrupt service availability, or expose personal data protected under GDPR. Given that Booking Ultra Pro likely manages customer and scheduling information, exploitation could lead to reputational damage, regulatory penalties, and operational disruptions. The requirement for high privileges limits exploitation to insiders or compromised accounts, but insider threats or credential theft scenarios remain plausible. The scope change indicates that exploitation could affect other components or systems integrated with Booking Ultra Pro, amplifying the impact. European organizations with high reliance on this software for customer-facing or internal scheduling services should consider the risk significant enough to warrant prompt mitigation, especially in sectors like hospitality, healthcare, or public services where booking systems are critical.

1. Implement strict input validation and output encoding: Organizations should ensure that all user inputs in Booking Ultra Pro are properly sanitized and encoded before rendering in web pages, particularly for fields that accept rich text or HTML content. 2. Apply the principle of least privilege: Restrict user roles and permissions to minimize the number of users with high privileges capable of injecting malicious content. 3. Monitor and audit user inputs: Establish logging and monitoring to detect unusual or suspicious input patterns that may indicate attempted exploitation. 4. Deploy Content Security Policy (CSP): Use CSP headers to restrict the execution of unauthorized scripts in browsers, mitigating the impact of XSS payloads. 5. Segregate booking system access: Limit network and user access to Booking Ultra Pro to trusted users and networks, reducing exposure. 6. Stay updated on vendor patches: Although no patches are currently available, organizations should monitor Deetronix advisories and apply updates promptly once released. 7. Conduct security awareness training: Educate users about the risks of XSS and the importance of cautious interaction with booking system content. 8. Consider Web Application Firewalls (WAF): Deploy WAFs with rules to detect and block XSS attack patterns targeting Booking Ultra Pro endpoints.