CVE-2016-6603: ZOHO WebNMS Framework 5.2 and 5.2 SP1 allows remote attackers to bypass authentication and impersonate arbi...

Security readout for executives and security teams

CVE-2016-6603 is an authentication bypass in Zoho WebNMS Framework 5.2 and 5.2 SP1. A remote attacker could impersonate another user through a trusted HTTP header. For organizations using WebNMS to manage networks or services, this could turn a management interface into an unauthorized access path. Exposure is likely limited to environments still running Zoho WebNMS Framework 5.2 or 5.2 SP1, especially if the application is reachable by untrusted networks. Treat this as high priority if WebNMS 5.2 or 5.2 SP1 is present. Management platforms often have privileged reach, and authentication bypass can undermine normal access controls. Mitigation focus: Identify any WebNMS Framework 5.2 or 5.2 SP1 deployments.; Check Zoho/WebNMS guidance for fixed versions and protective configuration.; Restrict WebNMS access to trusted administrative networks only..

Prepared

Jun 13, 2026, 12:51 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.