A security flaw in the Claude for Chrome extension allows any rogue browser extension with access to claude.ai to forge a synthetic click that triggers Claude to read a user's Gmail, Google Docs, or Calendar, bypassing the intended trust boundary. While an approval prompt exists in default mode, users who have enabled "Act without asking" receive no warning at all, earning the vulnerability a CVSS score of 9.6 Critical. Manifold Security reported both this issue and a related flaw involving a URL parameter that bypasses permission checks in May 2025, but as of July 14th, eight versions later, neither has been patched.
