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Re: Claude for Chrome

Claude for Chrome seems to be walking right into the "lethal trifecta." https://simonwillison.net/2025/Jun/16/the-lethal-trifecta/

"The lethal trifecta of capabilities is:"

• Access to your private data—one of the most common purposes of tools in the first place!

• Exposure to untrusted content—any mechanism by which text (or images) controlled by a malicious attacker could become available to your LLM

• The ability to externally communicate in a way that could be used to steal your data (I often call this “exfiltration” but I’m not confident that term is widely understood.)

If your agent combines these three features, an attacker can easily trick it into accessing your private data and sending it to that attacker.

dfabulich, 9 hours ago

Simon Willison’s Weblog

The lethal trifecta for AI agents: private data, untrusted content, and external communication

If you are a user of LLM systems that use tools (you can call them “AI agents” if you like) it is critically important that you understand the risk of …

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www.tgoop.com/dddevelopment/1997

509 viewsAug 27 at 10:38

Re: Claude for Chrome

Claude for Chrome seems to be walking right into the "lethal trifecta." https://simonwillison.net/2025/Jun/16/the-lethal-trifecta/

"The lethal trifecta of capabilities is:"

• Access to your private data—one of the most common purposes of tools in the first place!

• Exposure to untrusted content—any mechanism by which text (or images) controlled by a malicious attacker could become available to your LLM

• The ability to externally communicate in a way that could be used to steal your data (I often call this “exfiltration” but I’m not confident that term is widely understood.)

If your agent combines these three features, an attacker can easily trick it into accessing your private data and sending it to that attacker.

dfabulich, 9 hours ago

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