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Claude Code vulnerability enabling file exfiltration in Cowork

April 7, 2026Garry Tan

Garry Tan warns attackers can exfiltrate user files from Cowork via an unremediated vulnerability in Claude’s coding environment that now extends to Cowork, originally identified by Johann Rehberger.

Attackers can exfiltrate user files from Cowork by exploiting an unremediated vulnerability in Claude’s coding environment, which now extends to Cowork.
The vulnerability was first identified ... chat before Cowork existed by Johann Rehberger
The vulnerability was first identified
before Cowork existed by Johann Rehberger
Garry Tan
securitycoworkclaudeclaude codecomputer use

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