CVE-2025-39355 is a high-severity SQL Injection vulnerability (CWE-89) found in the roninwp FAT Services Booking plugin, affecting versions up to 5.6. This vulnerability arises due to improper neutralization of special elements in SQL commands, allowing an attacker with at least low privileges (PR:L) and no user interaction (UI:N) to inject malicious SQL code remotely (AV:N). The vulnerability impacts confidentiality significantly (C:H), with limited impact on availability (A:L) and no impact on integrity (I:N). The scope is changed (S:C), indicating that the vulnerability can affect resources beyond the initially vulnerable component. Exploiting this flaw could allow an attacker to extract sensitive data from the backend database, such as user information, booking details, or other confidential records managed by the plugin. Although no known exploits are currently reported in the wild, the high CVSS score of 8.5 reflects the potential severity and ease of exploitation due to network accessibility and low complexity. The plugin is commonly used in WordPress environments for service booking functionalities, making it a critical component for organizations relying on it for customer interactions and scheduling. The lack of available patches at the time of publication increases the urgency for mitigation and monitoring.

For European organizations, especially those in service industries such as hospitality, healthcare, or professional services that utilize the FAT Services Booking plugin, this vulnerability poses a significant risk to the confidentiality of customer and business data. Successful exploitation could lead to unauthorized data disclosure, undermining customer trust and potentially violating GDPR regulations due to exposure of personal data. The compromise could also facilitate further attacks by revealing internal database structures or credentials. Given the plugin’s integration with WordPress, a widely used CMS in Europe, the attack surface is broad. Disruption or data leakage could result in financial losses, reputational damage, and regulatory penalties. Organizations with multi-tenant environments or those handling sensitive booking information are particularly vulnerable. The limited impact on availability suggests that service disruption is less likely, but data confidentiality breaches remain a critical concern.

1. Immediate mitigation should include restricting access to the plugin’s administrative interfaces to trusted IP addresses and enforcing the principle of least privilege for user accounts with plugin access. 2. Implement Web Application Firewalls (WAF) with custom rules to detect and block SQL injection patterns targeting the plugin’s endpoints. 3. Conduct thorough input validation and sanitization on all user-supplied data interacting with the plugin, preferably using parameterized queries or prepared statements if custom code is involved. 4. Monitor logs for unusual database queries or access patterns indicative of exploitation attempts. 5. Stay alert for official patches or updates from roninwp and apply them promptly once available. 6. Consider temporarily disabling the plugin or replacing it with an alternative booking solution if patching is delayed and risk is unacceptable. 7. Conduct security awareness training for administrators to recognize and respond to potential exploitation signs. 8. Regularly back up databases and test restoration procedures to mitigate data loss risks.