Cursor Desktop sandbox escape via agent-controlled working directory

CriticalCVE-2026-50548 · Published Jun 5, 2026

### Summary Cursor runs agent terminal commands in a sandbox by default, and the sandbox grants write access to the command's working directory. A flaw was identified in how the agent could modify the `working_directory` parameter, which could cause the sandbox to include writable paths outside the intended workspace. ### Impact A malicious agent could set `working_directory` to a sensitive location and write arbitrary files outside the workspace under the user's privileges. This enables non-sandboxed Remote Code Execution — for example by overwriting the `cursorsandbox` helper so later commands run unsandboxed — with no user interaction beyond a benign prompt. ### Remediation Update Cursor to version 3.0. The sandbox no longer grants write access based on an agent-controlled working directory. ### Credit Cato AI Labs