What the Playwright Sandbox Debate Means for Your AI Agent

A reported security gap affects Playwright setups that use the test runner or default `chromium.launch()` configuration, which in Playwright 1.64.x relies on a pinned Chrome for Testing build predating four critical Chromium fixes and typically disables the Chromium sandbox. In contrast, Playwright MCP and the Playwright CLI generally launch the locally installed, sandboxed Chrome or Edge browser, so they are protected from the cited CVEs if the installed browser is updated to version 156.0.8078.73 or later; older MCP releases before 0.0.25 and root-run Docker environments are notable exceptions. The recommended distinction is to retain pinned, reproducible browsers for tests of trusted applications while using updated branded Chrome with the sandbox enabled for untrusted pages, ideally through `channel: 'chrome'` and `chromiumSandbox: true`. The discussion also stresses that browser patching and sandboxing do not prevent prompt injection, since malicious page content can still influence an AI agent, making isolation, non-root execution, restricted file and network access, fresh browser profiles, approval controls, and careful version pinning important for open-web agent browsing.

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