Wireless Mesh Networks (WMN) represents the fusion of ad-hoc and infrastructure wireless networking. The infrastructure of WMNs, namely mesh routers, are connected in an ad-hoc fashion exhibiting all pros and cons. Clients can be part of the infrastructure providing routing and connectivity for other clients that cannot directly reach mesh routers. The notion of coverage extension by using regular clients and the communication over a wireless backbone introduce new security threats. In the new security challenges arising from WMNs were identified as the detection of corrupted nodes, secure multi-hop routing and fairness wrt. to the distribution of network resources.