Wireless sensor networks (WSNs) self-organize clusters via communication between multiple sensor nodes that are deployed across a large field and an open environment. Therefore, nodes can be easily compromised, and attackers can launch false report injection attacks through compromised nodes. Several security protocols based on a message authentication code (MAC), such as the Probability Voting based Filtering Scheme, have been proposed to prevent application-layer attacks. MAC-based protocols remain vulnerable to high-level attacks where all MACs have false event values. We propose a temporal logic-based security model that allows the base station to defend against false report attacks by executing report authenticity detection using a temporal logic rule.