CVE-2025-68924 is a vulnerability identified in Umbraco Forms, a popular form-building product used within the Umbraco CMS ecosystem, affecting versions through 8.13.16. The vulnerability is classified under CWE-829, which involves the inclusion of functionality from an untrusted control sphere. Specifically, an authenticated attacker can supply a malicious Web Services Description Language (WSDL) URL as a data source within the form configuration. This malicious WSDL can cause the application to execute arbitrary code remotely on the server hosting Umbraco Forms. The attack vector is network-based (AV:N), requires low privileges (PR:L) but high attack complexity (AC:H), and does not require user interaction (UI:N). The vulnerability impacts the confidentiality, integrity, and availability of the system, as arbitrary code execution can lead to data theft, system manipulation, or denial of service. Although no known exploits have been reported in the wild, the high CVSS score of 7.5 indicates significant risk. The lack of available patches at the time of publication necessitates immediate attention to mitigation strategies. The root cause lies in insufficient validation and sanitization of external WSDL URLs, allowing attackers to inject malicious payloads through trusted application functionality. This vulnerability highlights the risks of integrating external data sources without rigorous security controls.

For European organizations, the impact of CVE-2025-68924 can be severe. Umbraco is widely used across Europe, particularly among small to medium enterprises and public sector websites due to its open-source nature and flexibility. Successful exploitation could lead to full system compromise, data breaches involving sensitive personal or business data, disruption of critical web services, and potential lateral movement within corporate networks. This could result in regulatory non-compliance under GDPR due to unauthorized data access or loss. Additionally, compromised web infrastructure can be leveraged for further attacks such as phishing or malware distribution. The requirement for authentication reduces the attack surface but insider threats or compromised credentials could facilitate exploitation. The high attack complexity somewhat limits mass exploitation but targeted attacks against high-value European entities remain a significant concern.

1. Immediate mitigation should focus on restricting access to Umbraco Forms administration interfaces to trusted personnel only, using strong authentication mechanisms such as multi-factor authentication (MFA). 2. Implement strict input validation and sanitization for any external URLs, especially WSDL data sources, to prevent injection of malicious content. 3. Network segmentation should be employed to isolate web servers running Umbraco Forms from critical internal systems, limiting the blast radius of any compromise. 4. Monitor logs and network traffic for unusual requests or connections to suspicious external WSDL URLs. 5. Employ web application firewalls (WAFs) with custom rules to detect and block malicious payloads targeting this vulnerability. 6. Stay informed on vendor updates and apply patches promptly once released. 7. Conduct regular security audits and penetration testing focused on web services integrations. 8. Educate administrators about the risks of adding untrusted external data sources and enforce strict change management policies.