Breaking origin isolation without breaking the browser

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Earlence Fernandes

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Apr 30, 2026, 11:38:58 PM (5 days ago) Apr 30
to Chrome Built-in AI Early Preview Program Discussions
I'm a security researcher and wrote this blog post about how WebMCP will break origin isolation on the web. Thoughts/feedback welcome!


Note: this was appropriately disclosed to the webmcp team head of publication.

-Earlence

Thomas Steiner

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May 4, 2026, 5:14:02 AM (yesterday) May 4
to Earlence Fernandes, Chrome Built-in AI Early Preview Program Discussions
Thank you, Earlence! For posterity, this was dealt with, see the comment thread on GitHub, especially this comment

Cheers,
Tom

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