Definition ∞ A Web2.5 vulnerability is a security weakness found where traditional web systems connect with new decentralized technologies. These vulnerabilities typically occur when Web2 infrastructure, like centralized databases or APIs, interacts with Web3 components, such as blockchain smart contracts or decentralized applications. Such integration points can introduce new attack vectors or expose existing weaknesses, allowing malicious actors to exploit the transition layer. Addressing these requires a comprehensive understanding of both centralized and decentralized security paradigms.
Context ∞ Crypto news increasingly discusses Web2.5 vulnerabilities as more traditional applications begin to integrate with blockchain, creating new security challenges. Reports often detail exploits that leverage weaknesses in bridges, oracles, or centralized components connected to decentralized protocols. The ongoing development of secure integration practices is a critical area for the safe expansion of Web3 technologies.