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AI coding agent tool Safari MCP had critical security flaw despite green tests

An open-source tool called Safari MCP, designed to allow AI coding agents to interact with a real Safari browser, was found to have a critical security flaw. Despite a test suite that consistently passed, none of its tests actually verified the core security boundary: ensuring the AI agent only interacts with tabs it opened. This oversight meant that a potential vulnerability, where an AI could mistakenly access or manipulate a user's sensitive tabs, would not have triggered a test failure. The developer has since implemented new tests to specifically address this boundary, ensuring that regressions will now cause tests to fail loudly. AI

IMPACT Highlights the critical need for robust behavioral testing in AI agents to prevent security vulnerabilities and ensure reliable operation.

RANK_REASON The item discusses a specific open-source tool and a security flaw within it, but does not represent a major industry shift or a frontier release.

Read on dev.to — MCP tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

AI coding agent tool Safari MCP had critical security flaw despite green tests

COVERAGE [1]

  1. dev.to — MCP tag TIER_1 English(EN) · אחיה כהן ·

    My MCP server had 32 green tests. Not one of them had ever called a tool.

    <p>For weeks my CI badge was green and I believed it.</p> <p><a href="https://github.com/achiya-automation/safari-mcp" rel="noopener noreferrer">Safari MCP</a> is an open-source tool that lets an AI coding agent drive a real, logged-in Safari — click, type, read the page, switch …