This vulnerability allows remote attackers to disclose sensitive information on affected installations of Advantech WebAccess/NMS. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the processing of calls to the getFWUpgradeInfo method of the DBUtil class. When parsing calls to the FWUpgradeInfo endpoint, the process does not properly validate a user-supplied string before using it to construct SQL queries. An attacker can leverage this vulnerability to disclose file contents in the context of SYSTEM.