CVE-2025-31635 is a high-severity path traversal vulnerability (CWE-22) affecting the LambertGroup CLEVER product, versions up to 2.6. Path traversal vulnerabilities occur when an application improperly restricts user-supplied input used to construct file or directory paths, allowing attackers to access files and directories outside the intended restricted directory. In this case, the vulnerability allows an unauthenticated remote attacker to craft specially crafted requests to access arbitrary files on the server hosting CLEVER. The CVSS 3.1 base score of 7.5 reflects that the vulnerability is remotely exploitable over the network without any privileges or user interaction, with a high impact on confidentiality but no impact on integrity or availability. This means attackers can read sensitive files, potentially including configuration files, credentials, or other sensitive data stored on the server, but cannot modify or delete files or disrupt service directly. No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability was reserved in late March 2025 and published in June 2025, indicating recent discovery and disclosure. The lack of a patch at this time increases the urgency for organizations using CLEVER to implement mitigations and monitor for updates. The vulnerability affects all versions up to 2.6, but the exact earliest affected version is unspecified (noted as 'n/a').

For European organizations using LambertGroup CLEVER, this vulnerability poses a significant risk to the confidentiality of sensitive data. Unauthorized file access could lead to leakage of intellectual property, customer data, internal configurations, or credentials, potentially facilitating further attacks such as privilege escalation or lateral movement. Organizations in sectors with strict data protection regulations, such as finance, healthcare, and government, could face regulatory penalties if sensitive personal or financial data is exposed. The lack of required authentication and user interaction means attackers can exploit this vulnerability remotely and automatically, increasing the likelihood of exploitation. While the vulnerability does not directly impact system integrity or availability, the confidentiality breach alone can have severe reputational and operational consequences. Additionally, attackers gaining access to sensitive files could leverage that information to launch more damaging attacks. The absence of known exploits in the wild currently provides a limited window for mitigation before active exploitation emerges.

European organizations should immediately conduct an inventory to identify all instances of LambertGroup CLEVER in their environment, especially versions up to 2.6. Until an official patch is released, organizations should implement strict network-level access controls to restrict external access to CLEVER services, ideally limiting access to trusted internal networks or VPNs. Web application firewalls (WAFs) or intrusion prevention systems (IPS) should be configured to detect and block path traversal attack patterns targeting CLEVER. Logging and monitoring should be enhanced to detect anomalous file access requests or suspicious activity indicative of exploitation attempts. Organizations should also review and harden file system permissions on servers running CLEVER to minimize the impact of unauthorized file reads. Once LambertGroup releases a security patch, organizations must prioritize timely deployment. Additionally, security teams should educate users and administrators about the vulnerability and maintain vigilance for indicators of compromise. If possible, consider temporary disabling or isolating vulnerable CLEVER instances until patched.