CVE-2025-5428 is a medium-severity vulnerability affecting juzaweb CMS versions 3.4.0 through 3.4.2. The issue lies in improper access controls within the /admin-cp/log-viewer component, specifically the Error Logs Page. This flaw allows an attacker to remotely access parts of the CMS administrative interface that should be restricted, potentially exposing sensitive error logs or administrative data. The vulnerability does not require user interaction or authentication, making it remotely exploitable over the network with low complexity. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N) indicates that an attacker with low privileges can exploit this vulnerability without user interaction, leading to limited confidentiality, integrity, and availability impacts. The vendor has not responded to the disclosure, and no patches or mitigations have been published yet. Although no known exploits are currently in the wild, public disclosure increases the risk of exploitation by threat actors.

For European organizations using juzaweb CMS, this vulnerability could lead to unauthorized access to administrative error logs, potentially exposing sensitive information such as system errors, configuration details, or user activity logs. This exposure could facilitate further attacks, including privilege escalation or targeted exploitation of other vulnerabilities. The improper access control could undermine the integrity of administrative functions and potentially disrupt availability if attackers manipulate logs or administrative settings. Organizations in sectors with strict data protection regulations (e.g., GDPR) could face compliance risks if sensitive data is leaked. The medium CVSS score reflects moderate risk, but the lack of vendor response and patch availability increases the urgency for organizations to implement compensating controls. The remote exploitability without user interaction or authentication makes this vulnerability particularly concerning for externally accessible CMS installations.

Given the absence of official patches, European organizations should immediately audit their juzaweb CMS installations to identify affected versions (3.4.0 to 3.4.2). As a temporary measure, restrict network access to the /admin-cp/log-viewer path using web application firewalls (WAFs) or reverse proxies to limit exposure to trusted IP addresses only. Implement strict access control policies at the network level to prevent unauthorized remote access to the administrative interface. Monitor web server and application logs for unusual access patterns targeting the log viewer or admin paths. Consider disabling or restricting the Error Logs Page functionality if possible until a patch is released. Organizations should also prepare for rapid patch deployment once the vendor releases an update and keep abreast of threat intelligence feeds for any emerging exploits. Conduct internal security awareness to ensure administrators recognize potential exploitation signs.