The metaverse, a convergence of digital and physical realities, presents unprecedented opportunities for interaction and commerce, but also introduces unique security vulnerabilities. This chapter explores the nature of these virtual environments, analyzing inherent weaknesses and the impact of user-generated content. It examines prevalent cyber threats, including malware, phishing, identity theft, and DDoS attacks, providing real-world examples of security breaches. By investigating notable incidents, the chapter highlights the impact on users and platforms and offers mitigation strategies to enhance security measures. Understanding the evolving threat landscape is crucial for developing effective security strategies to safeguard the future of the metaverse.