CVE-2025-67847 is a critical vulnerability identified in the Moodle learning management system, affecting versions 4.1.0 through 5.1.0. The flaw arises from improper control over code generation during the restore process, specifically due to insufficient validation of input data submitted to the restore interface. An attacker who has authenticated access to this interface can craft malicious restore data that the core restore routines interpret in unintended ways, leading to server-side execution of arbitrary code. This code injection vulnerability allows the attacker to execute commands with the privileges of the Moodle application, potentially escalating to full system compromise depending on the server configuration. The vulnerability is remotely exploitable over the network without requiring user interaction beyond authentication, making it a significant risk in environments where multiple users have restore privileges. The CVSS v3.1 score of 8.8 reflects high impact on confidentiality, integrity, and availability, with low attack complexity and no user interaction required. Although no public exploits have been reported yet, the nature of the vulnerability and Moodle's widespread use in educational institutions make it a critical issue. The lack of available patches at the time of reporting necessitates immediate risk mitigation through access control and monitoring until official fixes are released.

For European organizations, especially educational institutions and corporate training departments relying on Moodle, this vulnerability poses a severe risk. Exploitation could lead to unauthorized data access, data manipulation, or complete service disruption, undermining educational continuity and data privacy compliance obligations such as GDPR. The ability to execute arbitrary code on Moodle servers could also serve as a foothold for lateral movement within networks, potentially exposing sensitive personal data of students and staff. Given Moodle's popularity in Europe, a successful attack could impact thousands of institutions, causing reputational damage and financial losses. The high severity and ease of exploitation increase the urgency for European entities to address this vulnerability promptly. Additionally, the potential for full application compromise raises concerns about long-term persistence of attackers and the integrity of educational content and records.

European organizations should immediately review and restrict access to the Moodle restore interface, limiting it strictly to trusted administrators. Implement multi-factor authentication (MFA) for all accounts with restore privileges to reduce the risk of credential compromise. Monitor Moodle logs for unusual restore activities or unexpected input patterns that could indicate exploitation attempts. Until official patches are released, consider disabling the restore functionality if feasible or isolating Moodle servers within segmented network zones to limit potential lateral movement. Regularly update Moodle installations as patches become available and subscribe to Moodle security advisories for timely information. Conduct internal audits to identify all users with restore access and enforce the principle of least privilege. Employ web application firewalls (WAFs) with custom rules to detect and block suspicious payloads targeting the restore interface. Finally, prepare incident response plans specifically addressing potential Moodle compromises to enable rapid containment and recovery.