In a nutshell: A security vulnerability in the Claude Chrome Extension allows malicious extensions to trigger AI actions and access connected services such as Gmail and Google Docs.
A security vulnerability in Anthropic’s Claude extension for Chrome enables malicious browser extensions to trigger Claude’s predefined AI actions through simulated user clicks, thereby abusing Claude’s access to connected services such as Gmail, Google Docs, Google Calendar, and Salesforce.
A security flaw has been discovered in Anthropic’s Claude extension for Chrome that allows malicious browser extensions to manipulate Claude’s predefined actions. The attack model relies on the simulation of user clicks and an insufficient security model between browser extensions and the Claude application.
The vulnerability could allow attackers to access the integrated services that Claude is connected to. These include Gmail, Google Docs, Google Calendar, and Salesforce. An attacker could leverage these access rights to perform actions such as sending emails, editing documents, or manipulating calendar entries – all without explicit user confirmation.
For CISOs, this represents a significant risk in the adoption of AI assistants in the enterprise. The security flaw demonstrates the dangers of insufficiently isolated browser extensions that have access to sensitive cloud services. A malicious or compromised extension could not only undermine user trust but also lead to unauthorized changes to business data.
CISOs should review internal policies for browser extensions when authorizing such tools, ensure users only install authorized extensions, and control the permissions of AI assistants in access management systems. Anthropic has issued a statement regarding remediation of this security vulnerability, which should lead to prioritizing a rapid patching strategy.
Source: www.bleepingcomputer.com · Published 16 July 2026
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