CVE-2025-6057 is a critical vulnerability affecting the WPBookit plugin for WordPress, developed by iqonicdesign. The vulnerability arises from improper validation of file types in the handle_image_upload() function present in all versions up to and including 1.0.4. Specifically, the plugin fails to restrict the types of files that authenticated users with Subscriber-level access or higher can upload. This lack of validation allows these users to upload arbitrary files, including potentially malicious scripts or executables, to the web server hosting the WordPress site. Given that WordPress plugins typically run with the web server's privileges, an attacker who successfully uploads a malicious file could execute remote code, leading to full compromise of the affected system. The CVSS v3.1 base score of 8.8 reflects the high severity of this vulnerability, with an attack vector over the network (AV:N), low attack complexity (AC:L), requiring privileges (PR:L) but no user interaction (UI:N). The impact on confidentiality, integrity, and availability is high (C:H/I:H/A:H), indicating that exploitation could lead to data theft, unauthorized modifications, and service disruption. Although no known exploits are currently reported in the wild, the vulnerability's nature and ease of exploitation make it a significant threat to WordPress sites using WPBookit. The vulnerability is categorized under CWE-434, which concerns unrestricted upload of files with dangerous types, a common vector for web application compromise. Since the vulnerability affects all versions up to 1.0.4 and no patch links are provided yet, affected sites remain at risk until a fix is released and applied.

For European organizations, the impact of CVE-2025-6057 can be substantial. Many European businesses rely on WordPress for their web presence, including e-commerce, informational sites, and customer portals. The WPBookit plugin, used for booking and appointment management, is likely deployed in sectors such as hospitality, healthcare, and professional services. Exploitation could lead to unauthorized access to sensitive customer data, disruption of booking services, and potential defacement or takeover of websites. This could result in reputational damage, regulatory penalties under GDPR for data breaches, and financial losses. Additionally, compromised servers could be used as a pivot point for further attacks within the organization's network or as part of botnets, increasing the broader security risk. The requirement for only Subscriber-level privileges lowers the barrier for exploitation, as attackers could create or compromise low-privilege accounts to leverage this vulnerability. Given the high impact on confidentiality, integrity, and availability, organizations must prioritize addressing this threat to maintain operational continuity and compliance with European data protection laws.

To mitigate the risk posed by CVE-2025-6057, European organizations should take the following specific actions: 1) Immediately audit WordPress installations to identify the presence of the WPBookit plugin and confirm the version in use. 2) Restrict user account creation and enforce strict access controls to minimize the number of users with Subscriber-level or higher privileges, including implementing multi-factor authentication to reduce account compromise risk. 3) Monitor file upload directories for unusual or unauthorized file types and implement web application firewall (WAF) rules to detect and block suspicious upload attempts targeting WPBookit endpoints. 4) Employ file integrity monitoring to detect unauthorized changes or uploads on the server. 5) Until an official patch is released, consider disabling or removing the WPBookit plugin if it is not critical to business operations. 6) Engage with the plugin vendor or community to obtain updates or patches as soon as they become available and apply them promptly. 7) Conduct regular security assessments and penetration testing focusing on file upload functionalities to identify similar weaknesses. 8) Educate site administrators and users about the risks of privilege escalation and the importance of secure credential management. These targeted measures go beyond generic advice by focusing on access control, monitoring, and proactive plugin management tailored to this vulnerability.