When Zabbix Agent was installed on Windows into a custom installation directory, the installer did not verify whether the selected directory had secure access permissions. If the target directory allowed unauthorized users to modify its contents, an attacker could place a malicious DLL that could later be loaded by the application, resulting in DLL sideloading. The installer has been hardened to detect potentially unsafe installation directories and now requires explicit user confirmation before proceeding with installation in such locations. This reduces the risk of accidental installation into directories with inappropriate permissions while preserving compatibility with existing deployment scenarios.

When Zabbix Agent was installed on Windows into a custom installation directory, the installer did not verify whether the selected directory had secure access permissions. If the target directory allowed unauthorized users to modify its contents, an attacker could place a malicious DLL that could later be loaded by the application, resulting in DLL sideloading. The installer has been hardened to detect potentially unsafe installation directories and now requires explicit user confirmation before proceeding with installation in such locations. This reduces the risk of accidental installation into directories with inappropriate permissions while preserving compatibility with existing deployment scenarios.

Zabbix agent provided by Zabbix LLC may load Dynamic Link Libraries insecurely due to the following vulnerability.<a href='https://cwe.mitre.org/data/definitions/276.html' target='_blank'></a><a href='https://www.cve.org/CVERecord?id=CVE-2026-59781' target='_blank'></a><ul><li>Incorrect default permissions (CWE-276) - CVE-2026-59781</li></ul>Kazuma Matsumoto of GMO Cybersecurity by IERAE, Inc. reported this vulnerability to IPA. JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.

Affected: Ubuntu:Pro:14.04:LTS: zabbix, Ubuntu:Pro:16.04:LTS: zabbix, Ubuntu:Pro:18.04:LTS: zabbix, Ubuntu:Pro:20.04:LTS: zabbix, Ubuntu:Pro:22.04:LTS: zabbix, Ubuntu:26.04:LTS: zabbix

When Zabbix Agent was installed on Windows into a custom installation directory, the installer did not verify whether the selected directory had secure access permissions. If the target directory allowed unauthorized users to modify its contents, an attacker could place a malicious DLL that could later be loaded by the application, resulting in DLL sideloading. The installer has been hardened to detect potentially unsafe installation directories and now requires explicit user confirmation before proceeding with installation in such locations. This reduces the risk of accidental installation into directories with inappropriate permissions while preserving compatibility with existing deployment scenarios.

Ein Angreifer kann mehrere Schwachstellen in Zabbix ausnutzen, um Informationen offenzulegen oder zu manipulieren, um Sicherheitsmechanismen zu umgehen, um einen Denial of Service herbeizuführen, um einen Cross-Site Scripting Angriff durchzuführen und potenziell um Code auszuführen.