CVE-2025-30973 is a critical security vulnerability classified under CWE-502: Deserialization of Untrusted Data, affecting Codexpert, Inc's CoSchool LMS product up to version 1.4.3. The vulnerability arises from the unsafe deserialization of data inputs, which allows an attacker to perform object injection attacks. This means that an attacker can craft malicious serialized objects that, when deserialized by the application, can lead to arbitrary code execution, privilege escalation, or other malicious activities. The vulnerability has a CVSS v3.1 base score of 9.8, indicating it is critical with network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), and no user interaction needed (UI:N). The impact affects confidentiality, integrity, and availability (C:H/I:H/A:H), making it a highly severe threat. The vulnerability is exploitable remotely without authentication, increasing the risk of widespread exploitation if left unpatched. Although no known exploits are currently reported in the wild, the nature of deserialization vulnerabilities and the critical CVSS score suggest that exploitation could lead to full system compromise. CoSchool LMS is a learning management system, which typically handles sensitive educational data, user credentials, and potentially integrates with other institutional systems, amplifying the risk if compromised.

For European organizations, especially educational institutions, universities, and training providers using CoSchool LMS, this vulnerability poses a significant risk. Exploitation could lead to unauthorized access to sensitive student and staff data, disruption of educational services, and potential lateral movement within institutional networks. Given the criticality, attackers could deploy ransomware, steal intellectual property, or manipulate academic records. The impact extends beyond data loss to reputational damage and regulatory consequences under GDPR due to potential personal data breaches. The remote, unauthenticated nature of the vulnerability means attackers can target these systems directly over the internet, increasing exposure. Additionally, the disruption of LMS services could affect remote learning continuity, which remains vital in many European countries. The absence of patches at the time of publication further elevates the risk for organizations that have not implemented compensating controls.

Immediate mitigation steps include isolating CoSchool LMS instances from direct internet exposure by implementing network segmentation and firewall rules to restrict access to trusted IPs only. Organizations should monitor network traffic and application logs for unusual deserialization patterns or unexpected object payloads. Employing Web Application Firewalls (WAFs) with custom rules to detect and block suspicious serialized data can provide temporary protection. Since no official patches are available yet, organizations should engage with Codexpert, Inc for timelines and consider applying virtual patching techniques. Additionally, conducting a thorough security review of the LMS deployment, including disabling unnecessary features that process serialized data, can reduce the attack surface. Regular backups and incident response plans should be updated to prepare for potential exploitation. Finally, educating administrators about this vulnerability and enforcing strict input validation where possible can help mitigate risks until a patch is released.