A new phishing campaign named CoPhish has been discovered targeting OAuth tokens through malicious Copilot Studio agents. This sophisticated attack exploits OAuth authorization flows to steal tokens, allowing attackers to gain unauthorized access to user accounts and sensitive data. The campaign leverages social engineering techniques and automated agents within Copilot Studio to trick users into granting permissions that enable token theft. Once compromised, these tokens can be used to bypass traditional authentication methods, posing significant risks to organizations relying on OAuth for secure access management.
The CoPhish attack highlights the evolving threat landscape where attackers increasingly target OAuth tokens, which are critical for modern authentication and authorization processes. Security experts recommend organizations to implement stringent OAuth token monitoring, enforce least privilege principles, and educate users about the risks of granting excessive permissions to third-party applications. Additionally, deploying multi-factor authentication (MFA) and regularly reviewing OAuth app permissions can mitigate the impact of such attacks.
This incident underscores the importance of continuous security awareness and proactive defense mechanisms against emerging phishing tactics that exploit trusted platforms like Copilot Studio. Organizations should also consider integrating advanced threat detection solutions capable of identifying anomalous OAuth token usage and suspicious agent activities. By staying vigilant and adopting comprehensive security strategies, businesses can better protect their digital assets from sophisticated phishing threats like CoPhish.
This Cyber News was published on www.bleepingcomputer.com. Publication date: Sat, 25 Oct 2025 16:35:14 +0000