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A flaw in Anthropic's Claude for Chrome browser extension could allow a malicious extension to trigger predefined AI actions by simulating user clicks, potentially allowing it to abuse Claude's access to connected services such as Gmail, Google Docs, Google Calendar, and Salesforce. [...]

Cybersecurity researchers have discovered a new campaign in which a cluster of 108 Google Chrome extensions has been found to communicate with the same command-and-control (C2) infrastructure with the goal of collecting user data and enabling browser-level abuse by injecting ads and arbitrary JavaScript code into every web page visited

Threat actor exploited phishing and OAuth abuse to inject malicious code Cybersecurity outfit Sekoia is warning Chrome users of a supply chain attack targeting browser extension developers that has potentially impacted hundreds of thousands of individuals already.…

Meta says it's on top of access token abuse but also needs Google's help Analysis Multiple Chrome browser extensions make use of a session token for Meta's Facebook that grants access to signed-in users' social network data in a way that violates the company's policies and leaves users open to potential privacy violations.…