CVE-2025-34188 is a vulnerability identified in Vasion Print Virtual Appliance Host versions prior to 1.0.735 and the corresponding macOS/Linux client applications prior to version 20.0.1330. The issue arises from the local logging mechanism that improperly stores sensitive authentication session tokens—specifically PHPSESSID, XSRF-TOKEN, and laravel_session—in cleartext within log files accessible by any local user. These log files have world-readable permissions, allowing any user with local access to the machine to read them and extract session tokens. These tokens can then be used to authenticate remotely to the Vasion SaaS environment, bypassing normal login credentials and authentication controls. This leads to a significant risk of unauthorized access to the SaaS environment, potentially exposing sensitive information and allowing attackers to perform actions with the privileges of the compromised sessions. The vulnerability is classified under CWE-532, which concerns the insertion of sensitive information into log files, a common security misconfiguration that can lead to credential leakage. The CVSS 4.0 vector indicates the attack requires local access (AV:L), low attack complexity (AC:L), no authentication required (AT:N), and low privileges (PR:L), with no user interaction (UI:N). The impact on confidentiality and integrity is high, while availability impact is low. No known exploits have been reported in the wild yet, but the vulnerability is publicly disclosed and rated with a high severity score of 8.4. The vendor has acknowledged the issue as V-2022-008 but has not yet released patches at the time of this report.

For European organizations, this vulnerability poses a significant risk especially in environments where multiple users have local access to print appliance hosts or client machines. Attackers or malicious insiders with local user accounts can extract session tokens from log files and gain unauthorized remote access to the Vasion SaaS environment, potentially compromising sensitive print management data and other connected services. This can lead to data breaches, unauthorized configuration changes, and disruption of print services. Organizations in sectors with strict data protection requirements such as finance, healthcare, and government are particularly vulnerable to compliance violations and reputational damage. The ease of exploitation by any local user without elevated privileges increases the threat surface, especially in shared or poorly secured environments. The lack of user interaction and the ability to bypass normal authentication mechanisms further exacerbate the risk. Although no exploits are currently known in the wild, the public disclosure and high CVSS score necessitate urgent attention to prevent exploitation.

To mitigate CVE-2025-34188, organizations should immediately review and restrict permissions on log files generated by Vasion Print Virtual Appliance Hosts and client applications to ensure they are not world-readable. Implement strict access controls so that only trusted administrators can access these logs. Rotate and invalidate existing session tokens to prevent reuse of leaked tokens. Monitor local user activity on affected systems for suspicious access patterns. Employ network segmentation to limit local access to print appliance hosts. Where possible, deploy endpoint detection and response (EDR) solutions to detect unauthorized access attempts. Apply vendor patches or updates as soon as they become available. Additionally, consider disabling or limiting local logging of sensitive authentication tokens if configurable. Educate local users about the risks of local credential exposure and enforce least privilege principles to minimize the number of users with local access. Conduct regular audits of log file permissions and session management practices to ensure compliance with security policies.